Biological products

ABSTRACT

There is disclosed antibody molecules containing at least one CDR derived from a mouse monoclonal antibody having specificity for human TNFα. There is also disclosed a CDR grafted antibody wherein at least one of the CDRs is a hybrid CDR. Further disclosed are DNA sequences encoding the chains of the antibody molecules, vectors, transformed host cells and uses of the antibody molecules in the treatment of diseases mediated by TNFα.

[0001] This application claims priority to patent application GreatBritain 0013810.7, filed Jun. 6, 2000, which is incorporated in itsentirety by reference herein.

FIELD OF THE INVENTION

[0002] The present invention relates to humanized antibody moleculesspecific to human TNFα, to processes for their production usingrecombinant DNA technology, and to their therapeutic uses.

BACKGROUND OF THE INVENTION

[0003] The present invention relates to an antibody molecule havingspecificity for antigenic determinants of human tumour necrosis factoralpha (TNFα). The present invention also relates to the therapeutic usesof the antibody molecule and methods for producing the antibodymolecule.

[0004] This invention relates to antibody molecules. In an antibodymolecule, there are two heavy chains and two light chains. Each heavychain and each light chain has at its N-terminal end a variable domain.Each variable domain is composed of four framework regions (FRs)alternating with three complementarily determining regions (CDRs). Theresidues in the variable domains are conventionally numbered accordingto a system devised by Kabat et al. This system is set forth in Kabat etal, 1987, in Sequences of Proteins of Immunological Interest, USDepartment of Health and Human Services, NIH, USA (hereafter “Kabat etal. (supra)”). This numbering system is used in the presentspecification except where otherwise indicated.

[0005] The Kabat residue designations do not always correspond directlywith the linear numbering of the amino acid residues. The actual linearamino acid sequence may contain fewer or additional amino acids than inthe strict Kabat numbering corresponding to a shortening of, orinsertion into, a structural component, whether framework or CDR, of thebasic variable domain structure. The correct Kabat numbering of residuesmay be determined for a given antibody by alignment of residues ofhomology in the sequence of the antibody with a “standard” Kabatnumbered sequence.

[0006] The CDRs of the heavy chain variable domain are located atresidues 31-35 (CDRH1), residues 50-65 (CDRH2) and residues 95-102(CDRH3) according to the Kabat numbering.

[0007] The CDRs of the light chain variable domain are located atresidues 24-34 (CDRL1), residues 50-56 (CDRL2) and residues 89-97(CDRL3) according to the Kabat numbering.

[0008] Construction of CDR-grafted antibodies is described in EuropeanPatent Application EP-A-0239400, which discloses a process in which theCDRs of a mouse monoclonal antibody are grafted onto the frameworkregions of the variable domains of a human immunoglobulin by sitedirected mutagenesis using long oligonucleotides. The CDRs determine theantigen binding specificity of antibodies and are relatively shortpeptide sequences carried on the framework regions of the variabledomains.

[0009] The earliest work on humanising monoclonal antibodies byCDR-grafting was carried out on monoclonal antibodies recognisingsynthetic antigens, such as NP. However, examples in which a mousemonoclonal antibody recognising lysozyme and a rat monoclonal antibodyrecognising an antigen on human T-cells were humanised by CDR-graftinghave been described by Verhoeyen et al. (Science, 239, 1534-1536, 1988)and Riechmann et al (Nature, 332, 323-324, 1988), respectively.

[0010] Riechmann et al., found that the transfer of the CDRs alone (asdefined by Kabat (Kabat et al. (supra) and Wu et al., J. Exp. Med., 132,211-250, 1970)) was not sufficient to provide satisfactory antigenbinding activity in the CDR-grafted product. It was found that a numberof framework residues have to be altered so that they correspond tothose of the donor framework region. Proposed criteria for selectingwhich framework residues need to be altered are described inInternational Patent Application WO 90/07861.

[0011] A number of reviews discussing CDR-grafted antibodies have beenpublished, including Vaughan et al. (Nature Biotechnology, 16, 535-539,1998).

[0012] TNFα is a pro-inflammatory cytokine that is released by andinteracts with cells of the immune system. Thus, TNFα is released bymacrophages that have been activated by lipopolysaccharides (LPS) ofgram negative bacteria. As such, TNFα appears to be an endogenousmediator of central importance involved in the development andpathogenesis of endotoxic shock associated with bacterial sepsis. TNFαhas also been shown to be up-regulated in a number of human diseases,including chronic diseases such as rheumatoid arthritis, Crohn'sdisease, ulcerative colitis and multiple sclerosis. Mice transgenic forhuman TNFα produce high levels of TNFα constitutively and develop aspontaneous, destructive polyarthritis resembling rheumatoid arthritis(Kaffer et al, EMBO J., 10, 4025-4031, 1991). TNFα is therefore referredto as a pro-inflammatory cytokine.

[0013] Monoclonal antibodies against TNFα have been described in theprior art. Meager et al., (Hybridoma, 6 305-311, 1987) describe murinemonoclonal antibodies against recombinant TNFα. Fendly et al.,(Hybridoma, 6, 359-370, 1987) describe the use of murine monoclonalantibodies against recombinant TNFα in defining neutralising epitopes onTNF. Shimamoto et al., (Immunology Letters, 17 311-318, 1988) describethe use of murine monoclonal antibodies against TNFγ and their use inpreventing endotoxic shock in mice. Furthermore, in International PatentApplication WO 92/11383, recombinant antibodies, including CDR-graftedantibodies, specific for TNFα are disclosed. Rankin et al., (British J.Rheumatology, 34, 334-342, 1995) describe the use of such CDR-graftedantibodies in the treatment of rheumatoid arthritis. U.S. Pat No.5,919,452 discloses anti-TNF chimeric antibodies and their use intreating pathologies associated with the presence of TNF.

[0014] Antibodies to TNFα have been proposed for the prophylaxis andtreatment of endotoxic shock (Beutler et al., Science, 234, 470-474,1985). Bodmer et al., (Critical Care Medicine, 21, S441-S446, 1993) andWherry et al., (Critical Care Medicine, 21, S436-S440, 1993) discuss thetherapeutic potential of anti-TNFα antibodies in the treatment of septicshock. The use of anti-TNFα antibodies in the treatment of septic shockis also discussed by Kirschenbaum et al., (Critical Care Medicine, 26,1625-1626, 1998). Collagen-induced arthritis can be treated effectivelyusing an anti-TNFα monoclonal antibody (Williams et al. (PNAS-USA, 89,9784-9788, 1992)).

[0015] Increased levels of TNFα are found in both the synovial fluid andperipheral blood of patients suffering from rheumatoid arthritis. WhenTNFα blocking agents are administered to patients suffering fromrheumatoid arthritis, they reduce inflammation, improve symptoms andretard joint damage (McKown et al. (Arthritis Rheum., 42, 1204-1208,1999).

[0016] The use of anti-TNFα antibodies in the treatment of rheumatoidarthritis and Crohn's disease is discussed in Feldman et al.,(Transplantation Proceedings, 30, 4126-4127, 1998), Adorini et al.,(Trends in Immunology Today, 18, 209-211, 1997) and in Feldman et al.,(Advances in Immunology, 64, 283-350, 1997). The antibodies to TNFα usedin such treatments are generally chimeric antibodies, such as thosedescribed in U.S. Pat No. 5,919,452.

[0017] Two TNFα blocking products are currently licensed for thetreatment of rheumatoid arthritis. The first, called etanercept, ismarketed by Immunex Corporation as Enbrel™. It is a recombinant fusionprotein comprising two p75 soluble TNF-receptor domains linked to the Fcportion of a human immunoglobulin. The second, called infliximab, ismarketed by Centocor Corporation as Remicade™. It is a chimeric antibodyhaving murine anti-TNFα variable domains and human IgG1 constantdomains.

[0018] The prior art recombinant anti-TNFα antibody molecules generallyhave a reduced affinity for TNFα compared to the antibodies from whichthe variable regions or CDRs are derived, generally have to be producedin mammalian cells and are expensive to manufacture. Prior art anti-TNFαantibodies are described in Stephens et al., (Immunology, 85, 668-674,1995), GB-A-2 246 570 and GB-A-2 297 145.

[0019] There is a need for an antibody molecule to treat chronicinflammatory diseases which can be used repeatedly and produced easilyand efficiently. There is also a need for an antibody molecule which hashigh affinity for TNFα and low immunogenicity in humans.

SUMMARY OF THE INVENTION

[0020] In a first aspect, the present invention provides an antibodymolecule having specificity for TNFα, comprising a heavy chain whereinthe variable domain comprises a CDR (as defined by Kabat et al.,(supra)) having the sequence given as H1 in FIG. 3 (SEQ ID NO:1) forCDRH1, as H2′ in FIG. 3 (SEQ ID NO:2) or as H2 in FIG. 3 (SEQ ID NO:7)for CDRH2 or as H3 in FIG. 3 (SEQ ID NO:3) for CDRH3.

[0021] The antibody molecule of the first aspect of the presentinvention comprises at least one CDR selected from H1, H2′ or H2 and H3(SEQ ID NO:1; SEQ ID NO:2 or SEQ ID NO:7 and SEQ ID NO:3) for the heavychain variable domain. Preferably, the antibody molecule comprises atleast two and more preferably all three CDRs in the heavy chain variabledomain.

[0022] In a second aspect of the present invention, there is provided anantibody molecule having specificity for human TNFα, comprising a lightchain wherein the variable domain comprises a CDR (as defined by Kabatet al., (supra)) having the sequence given as L1 in FIG. 3 (SEQ ID NO:4)for CDRL1, L2 in FIG. 3 (SEQ ID NO:5) for CDRL2 or L3 in FIG. 3 (SEQ IDNO:6) for CDRL3.

[0023] The antibody molecule of the second aspect of the presentinvention comprises at least one CDR selected from L1, L2 and L3 (SEQ IDNO:4 to SEQ ID NO:6) for the light chain variable domain. Preferably,the antibody molecule comprises at least two and more preferably allthree CDRs in the light chain variable domain.

[0024] The antibody molecules of the first and second aspects of thepresent invention preferably have a complementary light chain or acomplementary heavy chain, respectively.

[0025] Preferably, the antibody molecule of the first or second aspectof the present invention comprises a heavy chain wherein the variabledomain comprises a CDR (as defined by Kabat et al., (supra)) having thesequence given as H1 in FIG. 3 (SEQ ID NO:1) for CDRH1, as H2′ or H2 inFIG. 3 (SEQ ID NO:2 or SEQ ID NO:7) for CDRH2 or as H3 in FIG. 3 (SEQ IDNO:3) for CDRH3 and a light chain wherein the variable domain comprisesa CDR (as defined by Kabat et al, (supra)) having the sequence given asL1 in FIG. 3 (SEQ ID NO:4) for CDRL1, as L2 in FIG. 3 (SEQ ID NO:5) forCDRL2 or as L3 in FIG. 3 (SEQ ID NO:6) for CDRL3.

BRIEF DESCRIPTION OF THE DRAWINGS

[0026]FIG. 1. FIG. 1 shows the framework regions of the human lightchain subgroup 1 compared to the framework regions of the hTNF40 lightchain (SEQ ID NOS:83 to 90).

[0027]FIG. 2. FIG. 2 shows the framework regions of the human heavychain subgroup and subgroup 3 compared to the framework regions of thehTNF40 heavy chain (SEQ ID NOS:91 to 98 and 106 to 109).

[0028]FIG. 3. FIG. 3 shows the amino acid sequence of the CDRs of hTNF40(SEQ ID NOS:1 to 7), wherein CDR H2′ is a hybrid CDR wherein theC-terminal six amino acids are from the H2 CDR sequence of a humansubgroup 3 germline antibody and the amino acid changes to the sequenceresulting from this hybridisation are underlined.

[0029]FIG. 4. FIG. 4 shows vector pMR15.1.

[0030]FIG. 5. FIG. 5 shows vector pMR14.

[0031]FIG. 6. FIG. 6 shows the nucleotide and predicted amino acidsequence of the murine hTNF40V1 (SEQ ID NO: 99).

[0032]FIG. 7. FIG. 7 shows the nucleotide and predicted amino acidsequence of the murine hTNF40Vh (SEQ ID NO:100).

[0033]FIG. 8. FIG. 8 shows the nucleotide and predicted amino acidsequence of hTNF40-gL1 (SEQ ID NO:8).

[0034]FIG. 9. FIG. 9 shows the nucleotide and predicted amino acidsequence of hTNF40-gL2 (SEQ ID NO:9).

[0035]FIG. 10. FIG. 10 shows the nucleotide and predicted amino acidsequence of gh1hTNF40.4 (SEQ ID NO:10).

[0036]FIG. 11. FIG. 11 shows the nucleotide and predicted amino acidsequence of gh3hTNF40.4 (SEQ ID NO:11).

[0037]FIG. 12. FIG. 12 shows vector CTIL5-gL6.

[0038]FIG. 13. FIG. 13 shows the structure of a compound called CDP870comprising a modified Fab fragment derived from antibody hTNF40covalently linked via a cysteine residue to a lysyl-maleimide linkerwherein each amino group on the lysyl residue has covalently attached toit a methoxy PEG residue wherein n is about 420.

[0039]FIG. 14. FIG. 14 shows vector pTTQ9.

[0040]FIG. 15. FIG. 15 shows the sequence of the OmpA oligonucleotideadapter (SEQ ID NO:101). Internal restriction sites are shown in bold.The 5′ XhoI cohesive end ligates into the vectorSall site, blocking it.S.D. represents the OmpA Shine Dalgarno sequence.

[0041]FIG. 16. FIG. 16 shows vector pACYC184.

[0042]FIG. 17. FIG. 17 shows vector pTTO-1.

[0043]FIG. 18. FIG. 18 shows vector pTTO-2.

[0044]FIG. 19. FIG. 19 shows vector pDNAbEng-G1.

[0045]FIG. 20. FIG. 20 shows the oligonucleotide cassettes encodingdifferent intergenic sequences for E. Coli modified Fab expression (SEQID NOS:102 to 105).

[0046]FIG. 21. FIG. 21 shows periplasmic modified Fab accumulation ofIGS variants.

[0047]FIG. 23. FIG. 22 shows vector pTTO(CDP870).

[0048]FIG. 23. FIG. 23 shows the disease activity score (DAS) inpatients treated with different doses of CDP870 and placebo. Median andIQ ranges are presented for the per-protocol population with lastobservation carried forward. Small squares indicate placebo, diamondsindicate 1 mg/kg, triangles indicate 5 mg/kg and large squares indicate20 mg/kg.

[0049]FIG. 24. FIG. 24 shows the erythrocyte sedimentation rate (ESR)(FIG. 24A), C reactive protein (CRP) (FIG. 24B), tender joint count(FIG. 24C), swollen joint count (FIG. 24D), patient's assessment of pain(FIG. 24E), disability index (FIG. 24F), patient's global assessment ofdisease activity (FIG. 24G), physician's global assessment of diseaseactivity (FIG. 24H) in patients treated with different doses of CDP870and placebo. Median and IQ range are presented for the per-protocolpopulation with last observation carried forward. Small squares indicateplacebo, diamonds indicate 1 mg/kg, triangles indicate 5 mg/kg and largesquares indicate 20 mg/kg.

DETAILED DESCRIPTION OF THE INVENTION

[0050] The CDRs given in SEQ IDS NOS:1 and 3 to 7 and in FIG. 3 referredto above are derived from a mouse monoclonal antibody hTNF40. However,SEQ ID NO:2 consists of a hybrid CDR. The hybrid CDR comprises part ofheavy chain CDR2 from mouse monoclonal antibody hTNF40 (SEQ ID NO:7) andpart of heavy chain CDR2 from a human group 3 germline V regionsequence.

[0051] The complete sequences of the variable domains of the mousehTNF40 antibody are shown in FIG. 6 (light chain) (SEQ ID NO:99) andFIG. 7 (heavy chain) (SEQ ID NO:100). This mouse antibody is referred tobelow as “the donor antibody”.

[0052] A first alternatively preferred embodiment of the first or secondaspect of the present invention is the mouse monoclonal antibody hTNF40having the light and heavy chain variable domain sequences shown in FIG.6 (SEQ ID NO:99) and FIG. 7 (SEQ ID NO:100), respectively. The lightchain constant region of hTNF40 is kappa and the heavy chain constantregion is IgG2a.

[0053] In a second alternatively preferred embodiment, the antibodyaccording to either of the first and second aspects of the presentinvention is a chimeric mouse/human antibody molecule, referred toherein as the chimeric hTNF40 antibody molecule. The chimeric antibodymolecule comprises the variable domains of the mouse monoclonal antibodyhTNF40 (SEQ ID NOS:99 and 100) and human constant domains. Preferably,the chimeric hTNF40 antibody molecule comprises the human C kappa domain(Hieter et al., Cell, 22, 197-207, 1980; Genbank accession numberJ00241) in the light chain and the human gamma 4 domains (Flanagan etal., Nature, 300, 709-713, 1982) in the heavy chain.

[0054] In a third alternatively preferred embodiment, the antibodyaccording to either of the first and second aspects of the presentinvention is a CDR-grafted antibody molecule. The term “a CDR-graftedantibody molecule” as used herein refers to an antibody molecule whereinthe heavy and/or light chain contains one or more CDRs (including, ifdesired, a hybrid CDR) from the donor antibody (e.g. a murine monoclonalantibody) grafted into a heavy and/or light chain variable regionframework of an acceptor antibody (e.g. a human antibody).

[0055] Preferably, such a CDR-grafted antibody has a variable domaincomprising human acceptor framework regions as well as one or more ofthe donor CDRs referred to above.

[0056] When the CDRs are grafted, any appropriate acceptor variableregion framework sequence may be used having regard to the class/type ofthe donor antibody from which the CDRs are derived, including mouse,primate and human framework regions. Examples of human frameworks whichcan be used in the present invention are KOL, NEWM, REI, EU, TUR, TEI,LAY and POM (Kabat et al. (supra)). For example, KOL and NEWM can beused for the heavy chain, REI can be used for the light chain and EU,LAY and POM can be used for both the heavy chain and the light chain.The preferred framework regions for the light chain are the human group1 framework regions shown in FIG. 1 (SEQ ID NOS:83, 85, 87 and 89). Thepreferred framework regions for the heavy chain are the human group 1and group 3 framework regions shown in FIG. 2 (SEQ ID NOS:91, 93, 95 and97 and SEQ ID NOS:106, 107, 108 and 109), respectively.

[0057] In a CDR-grafted antibody of the present invention, it ispreferred to use as the acceptor antibody one having chains which arehomologous to the chains of the donor antibody. The acceptor heavy andlight chains do not necessarily need to be derived from the sameantibody and may, if desired, comprise composite chains having frameworkregions derived from different chains.

[0058] Also, in a CDR-grafted antibody of the present invention, theframework regions need not have exactly the same sequence as those ofthe acceptor antibody. For instance, unusual residues may be changed tomore frequently-occurring residues for that acceptor chain class ortype. Alternatively, selected residues in the acceptor framework regionsmay be changed so that they correspond to the residue found at the sameposition in the donor antibody. Such changes should be kept to theminimum necessary to recover the affinity of the donor antibody. Aprotocol for selecting residues in the acceptor framework regions whichmay need to be changed is set forth in WO 91/09967.

[0059] Preferably, in a CDR-grafted antibody molecule of the presentinvention, if the acceptor heavy chain has human group 1 frameworkregions (shown in FIG. 2) (SEQ ID NOS:91, 93, 95 and 97), then theacceptor framework regions of the heavy chain comprise, in addition toone or more donor CDRs, donor residues at positions 28, 69 and 71(according to Kabat et al. (supra)).

[0060] Alternatively, if the acceptor heavy chain has group 1 frameworkregions, then the acceptor framework regions of the heavy chaincomprise, in addition to one or more donor CDRs, donor residues atpositions 28, 38, 46, 67, 69 and 71 (according to Kabat et al. (supra).

[0061] Preferably, in a CDR-grafted antibody molecule of the presentinvention, if the acceptor heavy chain has human group 3 frameworkregions (shown in FIG. 2) (SEQ ID NOS:106, 107, 108 and 109), then theacceptor framework regions of the heavy chain comprise, in addition toone or more donor CDRs, donor residues at positions 27, 28, 30, 48, 49,69, 71, 73, 76 and 78 (according to Kabat et al. (supra)).

[0062] Preferably, in a CDR-grafted antibody molecule according to thepresent invention, if the acceptor light chain has human group 1framework regions (shown in FIG. 1) (SEQ ID NOS:83, 85, 87 and 89) thenthe acceptor framework regions of the light chain comprise donorresidues at positions 46 and 60 (according to Kabat et al. (supra)).

[0063] Donor residues are residues from the donor antibody, i.e. theantibody from which the CDRs were originally derived.

[0064] The antibody molecule of the present invention may comprise: acomplete antibody molecule, having full length heavy and light chains; afragment thereof, such as a Fab, modified Fab, Fab′, F(ab′)₂ or Fvfragment; a light chain or heavy chain monomer or dimer; a single chainantibody, e.g. a single chain Fv in which the heavy and light chainvariable domains are joined by a peptide linker. Similarly, the heavyand light chain variable regions may be combined with other antibodydomains as appropriate.

[0065] Preferably the antibody molecule of the present invention is aFab fragment. Preferably the Fab fragment has a heavy chain having thesequence given as SEQ ID NO:111 and a light chain having the sequencegiven as SEQ ID NO:113. The amino acid sequences given in SEQ ID NO:111and SEQ ID NO:113 are preferably encoded by the nucleotide sequencesgiven in SEQ ID NO:110 and SEQ ID NO:112, respectively.

[0066] Alternatively, it is preferred that the antibody molecule of thepresent invention is a modified Fab fragment wherein the modification isthe addition to the C-terminal end of its heavy chain one or more aminoacids to allow the attachment of an effector or reporter molecule.Preferably, the additional amino acids form a modified hinge regioncontaining one or two cysteine residue to which the effector or reportermolecule may be attached. Such a modified Fab fragment preferably has aheavy chain having the sequence given as SEQ ID NO:115 and the lightchain having the sequence given as SEQ ID NO:113. The amino acidsequence given in SEQ ID NO:115 is preferably encoded by the nucleotidesequence given in SEQ ID NO:114.

[0067] A preferred effector group is a polymer molecule, which may beattached to the modified Fab fragment to increase its half-life in vivo.

[0068] The polymer molecule may, in general, be a synthetic or anaturally occurring polymer, for example an optionally substitutedstraight or branched chain polyalkylene, polyalkenylene orpolyoxyalkylene polymer or a branched or unbranched polysaccharide, e.g.a homo- or heteropolysaccharide.

[0069] Particular optional substituents which may be present on theabove-mentioned synthetic polymers include one or more hydroxy, methylor methoxy groups. Particular examples of synthetic polymers includeoptionally substituted straight or branched chain poly(ethyleneglycol),poly(propyleneglycol) poly(vinylalcohol) or derivatives thereof,especially optionally substituted poly(ethyleneglycol) such asmethoxypoly(ethyleneglycol) or derivatives thereof Particular naturallyoccurring polymers include lactose, amylose, dextran, glycogen orderivatives thereof. “Derivatives” as used herein is intended to includereactive derivatives, for example thiol-selective reactive groups suchas maleimides and the like. The reactive group may be linked directly orthrough a linker segment to the polymer. It will be appreciated that theresidue of such a group will in some instances form part of the productas the linking group between the antibody fragment and the polymer.

[0070] The size of the polymer may be varied as desired, but willgenerally be in an average molecular weight range from 500 Da to 50000Da, preferably from 5000 to 4000 Da and more preferably from 25000 to4000 Da. The polymer size may in particular be selected on the basis ofthe intended use of the product. Thus, for example, where the product isintended to leave the circulation and penetrate tissue, for example foruse in the treatment of a tumour, it may be advantageous to use a smallmolecular weight polymer, for example with a molecular weight of around5000 Da. For applications where the product remains in the circulation,it may be advantageous to use a higher molecular weight polymer, forexample having a molecular weight in the range from 25000 Da to 40000Da.

[0071] Particularly preferred polymers include a polyalkylene polymer,such as a poly(ethyleneglycol) or, especially, amethoxypoly(ethyleneglycol) or a derivative thereof, and especially witha molecular weight in the range from about 25000 Da to about 40000 Da.

[0072] Each polymer molecule attached to the modified antibody fragmentmay be covalently linked to the sulphur atom of a cysteine residuelocated in the fragment. The covalent linkage will generally be adisulphide bond or, in particular, a sulphur-carbon bond.

[0073] Where desired, the antibody fragment may have one or moreeffector or reporter molecules attached to it. The effector or reportermolecules may be attached to the antibody fragment through any availableamino acid side-chain or terminal amino acid functional group located inthe fragment, for example any free amino, imino, hydroxyl or carboxylgroup.

[0074] An activated polymer may be used as the starting material in thepreparation of polymer-modified antibody fragments as described above.The activated polymer may be any polymer containing a thiol reactivegroup such as an α-halocarboxylic acid or ester, e.g. iodoacetamide, animide, e.g. maleimide, a vinyl sulphone or a disulphide. Such startingmaterials may be obtained commercially (for example from ShearwaterPolymers Inc., Huntsville, AL, USA) or may be prepared from commerciallyavailable starting materials using conventional chemical procedures.

[0075] As regards attaching poly(ethyleneglycol) (PEG) moieties,reference is made to “Poly(ethyleneglycol) Chemistry, Biotechnical andBiomedical Applications”, 1992, J. Milton Harris (ed), Plenum Press, NewYork, “Poly(ethyleneglycol) Chemistry and Biological Applications”,1997, J. Milton Harris and S. Zalipsky (eds), American Chemical Society,Washington DC and “Bioconjugation Protein Coupling Techniques for theBiomedical Sciences”, 1998, M. Aslam and A. Dent, Grove Publishers, NewYork.

[0076] Where it is desired to obtain an antibody fragment linked to aneffector or reporter molecule, this may be prepared by standard chemicalor recombinant DNA procedures in which the antibody fragment is linkedeither directly or via a coupling agent to the effector or reportermolecule either before or after reaction with the activated polymer asappropriate. Particular chemical procedures include, for example, thosedescribed in WO 93/62331, WO 92/22583, WO 90,195 and WO 89/1476.Alternatively, where the effector or reporter molecule is a protein orpolypeptide the linkage may be achieved using recombinant DNAprocedures, for example as described in WO 86/01533 and EP-A-0392745.

[0077] Preferably, the modified Fab fragment of the present invention isPEGylated (i.e. has PEG (poly(ethyleneglycol)) covalently attachedthereto) according to the method disclosed in EP-A-0948544. Preferablythe antibody molecule of the present invention is a PEGylated modifiedFab fragment as shown in FIG. 13. As shown in FIG. 13, the modified Fabfragment has a maleimide group covalently linked to a single thiol groupin a modified hinge region. A lysine residue is covalently linked to themaleimide group. To each of the amine groups on the lysine residue isattached a methoxypoly(ethyleneglycol) polymer having a molecular weightof approximately 20,000 Da. The total molecular weight of the entireeffector molecule is therefore approximately 40,000 Da.

[0078] Preferably, in the compound shown in FIG. 13, the heavy chain ofthe antibody part has the sequence given as SEQ ID NO:115 and the lightchain has the sequence given in SEQ ID NO:113. This compound is referredto herein as CDP870.

[0079] The constant region domains of the antibody molecule of thepresent invention, if present, may be selected having regard to theproposed function of the antibody molecule, and in particular theeffector functions which may be required. For example, the constantregion domains may be human IgA, IgD, IgE, IgG or IgM domains. Inparticular, human IgG constant region domains may be used, especially ofthe IgG1 and IgG3 isotypes when the antibody molecule is intended fortherapeutic uses and antibody effector functions are required.Alternatively, IgG2 and IgG4 isotypes may be used when the antibodymolecule is intended for therapeutic purposes and antibody effectorfunctions are not required, e.g. for simply blocking TNFα activity.

[0080] Also, the antibody molecule of the present invention may have aneffector or a reporter molecule attached to it. For instance, it mayhave a macrocycle, for chelating a heavy metal atom, or a toxin, such asricin, attached to it by a covalent bridging structure. Alternatively,procedures of recombinant DNA technology may be used to produce anantibody molecule in which the Fc fragment (CH2, CH3 and hinge domains),the CH2 and CH3 domains or the CH3 domain of a complete immunoglobulinmolecule has (have) been replaced by, or has attached thereto by peptidelinkage, a functional non-immunoglobulin protein, such as an enzyme ortoxin molecule.

[0081] The antibody molecule of the present invention preferably has abinding affinity of at least 0.85×10⁻¹⁰ M, more preferably at least0.75×10⁻¹ M and most preferably at least 0.5×10⁻¹⁰ M. (It is worthnoting that the preferred humanised antibody molecule of the presentinvention, as described below, has an affinity of about 0.5×10⁻¹⁰ M,which is better than the affinity of the murine monoclonal antibody fromwhich it is derived. The murine antibody has an affinity of about0.85×10⁻¹⁰ M.)

[0082] Preferably, the antibody molecule of the present inventioncomprises the light chain variable domain hTNF40-gL1 (SEQ ID NO:8) andthe heavy chain variable domain gh3hTNF40.4 (SEQ ID NO:11). Thesequences of the variable domains of these light and heavy chains areshown in FIGS. 8 and 11, respectively.

[0083] The present invention also relates to variants of the antibodymolecule of the present invention, which have an improved affinity forTNFα. Such variants can be obtained by a number of affinity maturationprotocols including mutating the CDRs (Yang et al, J. Mol. Biol., 254,392-403, 1995), chain shuffling (Marks et al., Bio/Technology, 10,779-783, 1992), use of mutator strains of E. coli (Low et al., J. Mol.Biol., 250, 359-368, 1996), DNA shuffling (Patten et al., Curr. Opin.Biotechnol., 8, 724-733, 1997), phage display (Thompson et al., J. Mol.Biol., 256, 77-88, 1996) and sexual PCR (Crameri et al., Nature, 391,288-291, 1998). Vaughan et al. (supra) discusses these methods ofaffinity maturation.

[0084] The present invention also provides a DNA sequence encoding theheavy and/or light chain(s) of the antibody molecule of the presentinvention.

[0085] Preferably, the DNA sequence encodes the heavy or the light chainof the antibody molecule of the present invention.

[0086] In one preferred embodiment, the DNA sequence encodes a lightchain and comprises the sequence shown in SEQ ID NO:8 (hTNF40-gL1) orSEQ ID NO:9 (h-TNF-40-gL2) or a degenerate equivalent thereof.

[0087] In an alternatively preferred embodiment, the DNA sequenceencodes a heavy chain and comprises the sequence shown in SEQ ID NO:10(gh1hTNF40.4) or SEQ ID NO:11 (gh3hTNF40.4) or a degenerate equivalentthereof.

[0088] The DNA sequence of the present invention may comprise syntheticDNA, for instance produced by chemical processing, cDNA, genomic DNA orany combination thereof.

[0089] The present invention also relates to a cloning or expressionvector comprising one or more DNA sequences of the present invention.Preferably, the cloning or expression vector comprises two DNAsequences, encoding the light chain and the heavy chain of the antibodymolecule of the present invention, respectively.

[0090] In a preferred embodiment, the present invention provides an E.coli expression vector comprising a DNA sequence of the presentinvention. Preferably the expression vector is pTTO(CDP870) as shownschematically in FIG. 22.

[0091] The present invention also comprises vector pDNAbEng-G1 as shownin FIG. 19.

[0092] General methods by which the vectors may be constructed,transfection methods and culture methods are well known to those skilledin the art. In this respect, reference is made to “Current Protocols inMolecular Biology”, 1999, F. M. Ausubel (ed), Wiley Interscience, NewYork and the Maniatis Manual produced by Cold Spring Harbor Publishing.

[0093] DNA sequences which encode the antibody molecule of the presentinvention can be obtained by methods well known to those skilled in theart. For example, DNA sequences coding for part or all of the antibodyheavy and light chains may be synthesised as desired from the determinedDNA sequences or on the basis of the corresponding amino acid sequences.

[0094] DNA coding for acceptor framework sequences is widely availableto those skilled in the art and can be readily synthesised on the basisof their known amino acid sequences.

[0095] Standard techniques of molecular biology may be used to prepareDNA sequences coding for the antibody molecule of the present invention.Desired DNA sequences may be synthesised completely or in part usingoligonucleotide synthesis techniques. Site-directed mutagenesis andpolymerase chain reaction (PCR) techniques may be used as appropriate.

[0096] Any suitable host cell/vector system may be used for expressionof the DNA sequences encoding the antibody molecule of the presentinvention. Bacterial, for example E. coli, and other microbial systemsmay be used, in part, for expression of antibody fragments such as Faband F(ab′)₂ fragments, and especially Fv fragments and single chainantibody fragments, for example, single chain Fvs. Eukaryotic, e.g.mammalian, host cell expression systems may be used for production oflarger antibody molecules, including complete antibody molecules.Suitable mammalian host cells include CHO, myeloma or hybridoma cells.

[0097] The present invention also provides a process for the productionof an antibody molecule according to the present invention comprisingculturing a host cell comprising a vector of the present invention underconditions suitable for leading to expression of protein from DNAencoding the antibody molecule of the present invention, and isolatingthe antibody molecule.

[0098] Preferably the process for the production of the antibodymolecule of the present invention comprises culturing E. coli comprisingan E. coli expression vector comprising the DNA sequence of the presentinvention under conditions suitable for leading to expression of proteinfrom the DNA sequence and isolating the antibody molecule. The antibodymolecule may be secreted from the cell or targeted to the periplasm bysuitable signal sequences. Alternatively, the antibody molecules mayaccumulate within the cell's cytoplasm. Preferably the antibody moleculeis targeted to the periplasm. Depending on the antibody molecule beingproduced and the process used, it is desirable to allow the antibodymolecules to refold and adopt a functional conformation. Procedures forallowing antibody molecules to refold are well known to those skilled inthe art.

[0099] The antibody molecule may comprise only a heavy or light chainpolypeptide, in which case only a heavy chain or light chain polypeptidecoding sequence needs to be used to transfect the host cells. Forproduction of products comprising both heavy and light chains, the cellline may be transfected with two vectors, a first vector encoding alight chain polypeptide and a second vector encoding a heavy chainpolypeptide. Alternatively, a single vector may be used, the vectorincluding sequences encoding light chain and heavy chain polypeptides.

[0100] The present invention also provides a therapeutic or diagnosticcomposition comprising an antibody molecule of the present invention incombination with a pharmaceutically acceptable excipient, diluent orcarrier.

[0101] The present invention also provides a process for preparation ofa therapeutic or diagnostic composition comprising admixing the antibodymolecule of the present invention together with a pharmaceuticallyacceptable excipient, diluent or carrier.

[0102] The antibody molecule may be the sole active ingredient in thetherapeutic or diagnostic composition or may be accompanied by otheractive ingredients including other antibody ingredients, for exampleanti-T cell, anti-IFNγ or anti-LPS antibodies, or non-antibodyingredients such as xanthines.

[0103] The pharmaceutical compositions should preferably comprise atherapeutically effective amount of the antibody of the invention. Theterm “therapeutically effective amount” as used herein refers to anamount of a therapeutic agent needed to treat, ameliorate or prevent atargeted disease or condition, or to exhibit a detectable therapeutic orpreventative effect. For any antibody, the therapeutically effectivedose can be estimated initially either in cell culture assays or inanimal models, usually in rodents, rabbits, dogs, pigs or primates. Theanimal model may also be used to determine the appropriate concentrationrange and route of administration. Such information can then be used todetermine useful doses and routes for administration in humans.

[0104] The precise effective amount for a human subject will depend uponthe severity of the disease state, the general health of the subject,the age, weight and gender of the subject, diet, time and frequency ofadministration, drug combination(s), reaction sensitivities andtolerance/response to therapy. This amount can be determined by routineexperimentation and is within the judgement of the clinician. Generally,an effective dose will be from 0.01 mg/kg to 50 mg/kg, preferably 0.1mg/kg to 20 mg/kg, more preferably about 15 mg/kg. As shown in theExamples below, doses of 1, 5 and 20 mg/kg have been used to treatpatients suffering from rheumatoid arthritis.

[0105] Compositions may be administered individually to a patient or maybe administered in combination with other agents, drugs or hormones.

[0106] The dose at which the antibody molecule of the present inventionis administered depends on the nature of the condition to be treated,the degree to which the level of TNFα to be neutralised is, or isexpected to be, raised above a desirable level, and on whether theantibody molecule is being used prophylactically or to treat an existingcondition.

[0107] Thus, for example, where the product is for treatment orprophylaxis of a chronic inflammatory disease, such as rheumatoidarthritis, suitable doses of the antibody molecule of the presentinvention lie in the range of between 0.5 and 50 mg/kg, more preferablybetween 1 and 20 mg/kg and most preferably about 15 mg/kg. The frequencyof dose will depend on the half-life of the antibody molecule and theduration of its effect.

[0108] If the antibody molecule has a short half-life (e.g. 2 to 10hours) it may be necessary to give one or more doses per day.Alternatively, if the antibody molecule has a long half life (e.g. 2 to15 days) it may only be necessary to give a dosage once per day, perweek or even once every 1 or 2 months.

[0109] A pharmaceutical composition may also contain a pharmaceuticallyacceptable carrier for administration of the antibody. The carriershould not itself induce the production of antibodies harmful to theindividual receiving the composition and should not be toxic. Suitablecarriers may be large, slowly metabolised macromolecules such asproteins, polypeptides, liposomes, polysaccharides, polylactic acids,polyglycolic acids, polymeric amino acids, amino acid copolymers andinactive virus particles.

[0110] Pharmaceutically acceptable salts can be used, for examplemineral acid salts, such as hydrochlorides, hydrobromides, phosphatesand sulphates, or salts of organic acids, such as acetates, propionates,malonates and benzoates.

[0111] Pharmaceutically acceptable carriers in therapeutic compositionsmay additionally contain liquids such as water, saline, glycerol andethanol. Additionally, auxiliary substances, such as wetting oremulsifying agents or pH buffering substances, may be present in suchcompositions. Such carriers enable the pharmaceutical compositions to beformulated as tablets, pills, dragees, capsules, liquids, gels, syrups,slurries and suspensions, for ingestion by the patient.

[0112] Preferred forms for administration include forms suitable forparenteral administration, e.g. by injection or infusion, for example bybolus injection or continuous infusion. Where the product is forinjection or infusion, it may take the form of a suspension, solution oremulsion in an oily or aqueous vehicle and it may contain formulatoryagents, such as suspending, preservative, stabilising and/or dispersingagents. Alternatively, the antibody molecule may be in dry form, forreconstitution before use with an appropriate sterile liquid.

[0113] Once formulated, the compositions of the invention can beadministered directly to the subject. The subjects to be treated can beanimals. However, it is preferred that the compositions are adapted foradministration to human subjects.

[0114] The pharmaceutical compositions of this invention may beadministered by any number of routes including, but not limited to,oral, intravenous, intramuscular, intra-arterial, intramedullary,intrathecal, intraventricular, transdermal, transcutaneous (for example,see WO98/20734), subcutaneous, intraperitoneal, intranasal, enteral,topical, sublingual, intravaginal or rectal routes. Hyposprays may alsobe used to administer the pharmaceutical compositions of the invention.Typically, the therapeutic compositions may be prepared as injectables,either as liquid solutions or suspensions. Solid forms suitable forsolution in, or suspension in, liquid vehicles prior to injection mayalso be prepared.

[0115] Direct delivery of the compositions will generally beaccomplished by injection, subcutaneously, intraperitoneally,intravenously or intramuscularly, or delivered to the interstitial spaceof a tissue. The compositions can also be administered into a lesion.Dosage treatment may be a single dose schedule or a multiple doseschedule.

[0116] It will be appreciated that the active ingredient in thecomposition will be an antibody molecule. As such, it will besusceptible to degradation in the gastrointestinal tract. Thus, if thecomposition is to be administered by a route using the gastrointestinaltract, the composition will need to contain agents which protect theantibody from degradation but which release the antibody once it hasbeen absorbed from the gastrointestinal tract.

[0117] A thorough discussion of pharmaceutically acceptable carriers isavailable in Remington's Pharmaceutical Sciences (Mack PublishingCompany, N.J. 1991).

[0118] It is also envisaged that the antibody of the present inventionwill be administered by use of gene therapy. In order to achieve this,DNA sequences encoding the heavy and light chains of the antibodymolecule under the control of appropriate DNA components are introducedinto a patient such that the antibody chains are expressed from the DNAsequences and assembled in situ.

[0119] The present invention also provides the antibody molecule of thepresent invention for use in treating a disease mediated by TNFα.

[0120] The present invention further provides the use of the antibodymolecule according to the present invention in the manufacture of amedicament for the treatment of a disease mediated by TNFα.

[0121] The antibody molecule of the present invention may be utilised inany therapy where it is desired to reduce the level of biologicallyactive TNFα present in the human or animal body. The TNFα may becirculating in the body or present in an undesirably high levellocalised at a particular site in the body.

[0122] For example, elevated levels of TNFα are implicated in acute andchronic immune and immunoregulatory disorders, infections includingseptic, endotoxic and cardiovascular shock, inflammatory disorders,neurodegenerative diseases, malignant diseases and alcohol inducedhepatitis. Details of the numerous disorders associated with elevatedlevels of TNFα are set out in U.S. Pat No. 5,919,452. The antibodymolecule of the present invention may be utilised in the therapy ofdiseases mediated by TNFα. Particularly relevant diseases which may betreated by the antibody molecule of the present invention includesepsis, congestive heart failure, septic or endotoxic shock, cachexia,adult respiratory distress syndrome, AIDS, allergies, psoriasis, TB,inflammatory bone disorders, blood coagulation disorders, burns,rejection episodes following organ or tissue transplant, Crohn's diseaseand autoimmune diseases, such as thyroiditis and rheumatoid- andosteo-arthritis.

[0123] Additionally, the antibody molecule or composition may be used:to reduce side effects associated with TNFα generation during neoplastictherapy; to eliminate or reduce shock-related symptoms associated withthe treatment or prevention of graft rejection by use of ananti-lymphocyte antibody; or for treating multi-organ failure.

[0124] The antibody molecule of the present invention is preferably usedfor treatment of rheumatoid- or osteo-arthritis.

[0125] The present invention also provides a method of treating human oranimal subjects suffering from or at risk of a disorder mediated byTNFα, the method comprising administering to the subject an effectiveamount of the antibody molecule of the present invention.

[0126] The antibody molecule of the present invention may also be usedin diagnosis, for example in the in vivo diagnosis and imaging ofdisease states involving elevated levels of TNFα.

[0127] The present invention also provides an antibody moleculecomprising a hybrid CDR comprising a truncated donor CDR sequencewherein the missing portion of the truncated donor CDR is replaced by adifferent sequence and forms a functional CDR. The term “hybrid CDR” asused herein means a CDR comprising a donor CDR which has been truncatedat one or more positions, for example at one or both of its ends. Themissing portion of the truncated donor CDR is replaced by a differentsequence to form a complete and functional CDR. The hybrid CDR has atleast one amino acid change compared to the complete donor CDR. Thesequence replacing the truncated portion of the CDR can be any sequence.Preferably the non-donor part of the CDR sequence is from the antibodyfrom which the framework regions of the antibody molecule are derived,such as a germline antibody sequence.

[0128] It has been found that antibody molecules comprising a hybrid CDRretain substantially the same binding affinity as an antibody moleculecomprising complete donor CDRs. The term “substantially the same bindingaffinity” as used herein means at least 70%, more preferably at least85% and most preferably at least 95% of the binding affinity of thecorresponding antibody molecule comprising complete donor CDRs. As notedabove, in certain cases, the affinity of the antibody of the inventionmay be greater than that of the donor antibody. The use of a hybrid CDRprovides the advantages of reducing the amount of foreign (i.e. donor)sequence present in the antibody molecule and may increase the bindingaffinity of the antibody molecule compared to the corresponding antibodymolecule comprising complete donor CDRs.

[0129] Any of the CDRs of the antibody molecule can be hybrid.Preferably CDR2 of the heavy chain is hybrid in the antibody molecule.

[0130] Preferably the truncation of the donor CDR is from 1 to 8 aminoacids, more preferably from 4 to 6 amino acids. It is further preferredthat the truncation is made at the C-terminus of the CDR.

[0131] Depending on the sequence of the truncated portion of the CDR andthe sequence of the different sequence replacing the missing portion, anumber of amino acid changes may be made. Preferably at least 2 aminoacid changes are made, more preferably at least 3 amino acid changes aremade and most preferably at least 4 amino acid changes are made.

[0132] A particular embodiment of this aspect of the invention is anantibody according to the first aspect of the invention wherein thesecond CDR in the heavy chain has the sequence given as SEQ ID NO:2.This has better affinity for its antigen than does the donor antibodyfrom which part of the CDR is derived.

[0133] The present invention also provides a nucleic acid sequence whichencodes the antibody molecule comprising a hybrid CDR of the presentinvention.

[0134] The present invention also provides an expression vectorcontaining the nucleic acid sequence encoding the antibody moleculecomprising a hybrid CDR of the present invention.

[0135] The present invention also provides a host cell transformed withthe vector of the present invention.

[0136] The present invention also provides a process for the productionof an antibody molecule comprising a hybrid CDR comprising culturing thehost cell of the present invention and isolating the antibody molecule.

[0137] The present invention is further described by way of illustrationonly in the following examples which refer to the accompanying Figures,in which:

EXAMPLES

[0138] Gene Cloning and Expression of a Chimeric hTNF40 AntibodyMolecule

[0139] RNA Preparation from hTNF40 Hybridoma Cells

[0140] Total RNA was prepared from 3×10⁷ hTNF40 hybridoma cells asdescribed below. Cells were washed in physiological saline and dissolvedin RNAzol (0.2 ml per 10⁶ cells). Chloroform (0.2 ml per 2 mlhomogenate) was added, the mixture shaken vigorously for 15 seconds andthen left on ice for 15 minutes. The resulting aqueous and organicphases were separated by centrifugation for 15 minutes in an Eppendorfcentrifuge and RNA was precipitated from the aqueous phase by theaddition of an equal volume of isopropanol. After 15 minutes on ice, theRNA was pelleted by centrifugation, washed with 70% ethanol, dried anddissolved in sterile, RNAse free water. The yield of RNA was 400 μg.

[0141] PCR Cloning of hTNF40 Vh and V1

[0142] cDNA sequences coding for the variable domains of hTNF40 heavyand light chains were synthesised using reverse transcriptase to producesingle stranded cDNA copies of the mRNA present in the total RNA,followed by Polymerase Chain Reaction (PCR) on the cDNAs with specificoligonucleotide primers.

[0143] a) cDNA Synthesis

[0144] cDNA was synthesised in a 20 μl reaction volume containing thefollowing reagents: 50 mM Tris-HCl pH 8.3, 75 mM KCl, 10 mMdithiothreitol, 3 mM MgCl₂, 0.5 mM each deoxyribonucleosidetriphosphate, 20 units RNAsin, 75 ng random hexanucleotide primer, 2 μghTNF40 RNA and 200 units Moloney Murine Leukemia Virus reversetranscriptase. After incubation at 42° C. for 60 minutes, the reactionwas terminated by heating at 95° C. for 5 minutes.

[0145] b) PCR

[0146] Aliquots of the cDNA were subjected to PCR using combinations ofprimers specific for the heavy and light chains. The nucleotidesequences of the 5′ primers for the heavy and light chains are shown inTables 1 and 2 respectively. These sequences all contain, in order, arestriction site starting 7 nucleotides from their 5′ ends, the sequenceGCCGCCACC (SEQ ID NO:12), to allow optimal translation of the resultingmRNAs, an initiation codon and 20-30 nucleotides based on the leaderpeptide sequences of known mouse antibodies (Kabat et al., Sequences ofproteins of immunological interest, 5th Edition, 1991, U.S. Departmentof Health and Human Services, Public Health Service, National Institutesof Health).

[0147] The 3′ primers are shown in Table 3. The light chain primer spansthe J-C junction of the antibody and contains a restriction site for theenzyme SplI to facilitate cloning of the V1 PCR fragment. The heavychain 3′ primers are a mixture designed to span the J-C junction of theantibody. The 3′ primer includes an ApaI restriction site to facilitatecloning. The 3′ region of the primers contains a mixed sequence based onthose found in known mouse antibodies (Kabat et al., 1991, supra).

[0148] The combinations of primers described above enable the PCRproducts for Vh and V1 to be cloned directly into an appropriateexpression vector (see below) to produce chimeric (mouse-human) heavyand light chains and for these genes to be expressed in mammalian cellsto produce chimeric antibodies of the desired isotype.

[0149] Incubations (100 μl) for the PCR were set up as follows. Eachreaction contained 10 mM Tris-HCl pH 8.3, 1.5 mM MgCl₂, 50 mM KCl, 0.01%w/v gelatin, 0.25 mM each deoxyribonucleoside triphosphate, 10 pmoles 5′primer mix (Table 4), 10 pmoles 3′ primer (CL12 (light chain) or R2155(heavy chain) (Table 3)), 1 μl cDNA and 1 unit Taq polymerase. Reactionswere incubated at 95° C. for 5 minutes and then cycled through 94° C.for 1 minute, 55° C. for 1 minute and 72° C. for 1 minute. After 30cycles, aliquots of each reaction were analysed by electrophoresis on anagarose gel. Light chain reactions containing 5′ primer mixes from lightchain pools 1, 2 and 7 produced bands with sizes consistent with fulllength V1 fragments while the reaction from heavy chain reaction pool 3produced a fragment with a size expected of a Vh gene. The band producedby the light chain pool 1 primers was not followed up as previousresults had shown that this band corresponds to a light chain pseudogeneproduced by the hybridoma cell. The band produced by the light chainpool 7 primers was weaker than the band from the pool 2 primers andtherefore was not followed up. Only the band from light chain reactionpool 2, which was the strongest band, was followed up.

[0150] c) Molecular Cloning of the PCR Fragments

[0151] The DNA fragments produced in the light chain reaction pool 2were digested with the enzymes BstBI and SplI, concentrated by ethanolprecipitation, electrophoresed on a 1.4% agarose gel and DNA bands inthe range of 400 base pairs recovered. These were cloned by ligationinto the vector pMR15.1 (FIG. 4) that had been restricted with BstBI andSplI. After ligation, mixtures were transformed into E. Coli LM 1035 andplasmids from the resulting bacterial colonies screened for inserts bydigestion with BstBI and SplI. Representatives with inserts from eachligation were analysed further by nucleotide sequencing.

[0152] In a similar manner, the DNA fragments produced in heavy chainreaction pool 3 were digested with HindIII and ApaI and cloned into thevector pMR14 (FIG. 5) that had been restricted with HindIII and ApaI.Again, representative plasmids containing inserts were analysed bynucleotide sequencing.

[0153] d) Nucleotide Sequence Analysis

[0154] Plasmid DNA from a number of isolates containing Vh inserts wassequenced using the primers R1053 (see Table 5) (which primes in the 3′region of the HCMV promoter in pMR14) and R720 (see Table 5) (whichprimes in the 5′ region of human C-gamma 4 and allows sequencing throughthe DNA insert on pMR14). It was found that the nucleotide sequences ofthe Vh insert in a number of clones were identical, except fordifferences in the signal peptide and J regions. This indicated that theclones examined are independent isolates arising from the use ofdifferent primers from the mixture of oligonucleotides during the PCRstage. The determined nucleotide sequence and predicted amino acidsequence of the variable domain of the heavy chain of antibody hTNF40(hTNF40Vh) are given in FIG. 7 (SEQ ID NO:100).

[0155] To analyse the light chain clones, the sequence derived frompriming with R1053 (see Table 5) and R684 (SEQ ID NO:62) (which primesin the 5′ region of human C-kappa and allows sequencing through the DNAinsert on pMR15.1) was examined. The nucleotide sequence and predictedamino acid sequence of the V1 genes arising from reactions in pool 2were similarly analysed. Again it was found that the nucleotidesequences of the V1 insert in a number of clones were identical, exceptfor differences in the signal peptide and J regions, indicating that theclones examined were independent isolates arising from the use ofdifferent primers from the mixture of oligonucleotides used during thePCR stage. The determined nucleotide sequence and predicted amino acidsequence of the variable domain of the light chain of antibody hTNF40(hTNF40V1) are given in FIG. 6 (SEQ ID NO:99). TABLE 1 Oligonucleotideprimers for the 5′ region of mouse heavy chains. CH1:5′ATGAAATGCAGCTGGGTCAT(G,C)TTCTT3′ (SEQ ID NO:13) CH2:5′ATGGGATGGAGCT(A,G)TATCAT(C,G)(C,T)TCTT3′ (SEQ ID NO:14) CH3:5′ATGAAG(A,T)TGTGGTTAAACTGGGTTTT3′ (SEQ ID NO:15) CH4:5′ATG(G,A)ACTTTGGG(T,C)TCAGCTTG(G,A)T3′ (SEQ ID NO:16) CH5:5′ATGGACTCCAGGCTCAATTTAGTTTT3′ (SEQ ID NO:17) CH6:    5′ATGGCTGTC(C,T)T(G,A)G(G,C)GCT(G,A)CTCTTCTG3′ (SEQ ID NO:18) CH7:    5′ATGG(G,A)ATGGAGC(G,T)GG(G,A)TCTTT(A,C)TCTT3′ (SEQ ID NO:19) CH8:5′ATGAGAGTGCTGATTCTTTTGTG3′ (SEQ ID NO:20) CH9:5′ATGG(C,A)TTGGGTGTGGA(A,C)CTTGCTATT3′ (SEQ ID NO:21) CH10:5′ATGGGCAGACTTACATTCTCATTCCT3′ (SEQ ID NO:22) CH11:5′ATGGATTTTGGGCTGATTTTTTTTATTG3′ (SEQ ID NO:23) CH12:5′ATGATGGTGTTAAGTCTTCTGTACCT3′ (SEQ ID NO:24)

[0156] Each of the above primers has the sequence5′GCGCGCAAGCTTGCCGCCACC3′ (SEQ ID NO:25) added to its 5′ end. TABLE 2Oligonucleotide primers for the 5′ region of mouse light chains. CL1:5′ATGAAGTTGCCTGTTAGGCTGTTGGTGCT3′ (SEQ ID NO:26) CL2:5′ATGGAG(T,A)CAGACACACTCCTG(T,C)TATGGGT3′ (SEQ ID NO:27) CL3:5′ATGAGTGTGCTCACTCAGGTCCT3′ (SEQ ID NO:28) CL4:5′ATGAGG(G,A)CCCCTGCTCAG(A,T)TT(C,T)TTGG3′ (SEQ ID NO:29) CL5:5′ATGGATTT(T,A)CAGGTGCAGATT(T,A)TCAGCTT3′ (SEQ ID NO:30) CL5A:5′ATGGATTT(T,A)CA(A,G)GTGCAGATT(T,A)TCAGCTT3′ (SEQ ID NO:31) CL6:5′ATGAGGT(T,G)C(T,C)(T,C)TG(T,C)T(G,C)AG(T,C)T(T,C)CTG(A,G)G3′ (SEQ IDNO:32) CL7: 5′ATGGGC(T,A)TCAAGATGGAGTCACA3′ (SEQ ID NO:33) CL8:5′ATGTGGGGA(T,C)CT(G,T)TTT(T,C)C(A,C)(A,C)TTTTTCAAT3′ (SEQ ID NO:34)CL9: 5′ATGGT(G,A)TCC(T,A)CA(G,C)CTCAGTTCCTT3′ (SEQ ID NO:35) CL10:5′ATGTATATATGTTTGTTGTCTATTTC3′ (SEQ ID NO:36) CL11:5′ATGGAAGCCCCAGCTCAGCTTCTCTT3′ (SEQ ID NO:37) CL12A:5′ATG(A,G)AGT(T,C)(A,T)CAGACCCAGGTCTT(T,C)(A,G)T3′ (SEQ ID NO:38) CL12B:5′ATGGAGACACATTCTCAGGTCTTTGT3′ (SEQ ID NO:39) CL13:5′ATGGATTCACAGGCCCAGGTTCTTAT3′ (SEQ ID NO:40) CL14:5′ATGATGAGTCCTGCCCAGTTCCTGTT3′ (SEQ ID NO:41) CL15:5′ATGAATTTGCCTGTTCATCTCTTGGTGCT3′ (SEQ ID NO:42) CL16:5′ATGGATTTTCAATTGGTCCTCATCTCCTT3′ (SEQ ID NO:43) CL17A:5′ATGAGGTGCCTA(A,G)CT(C,G)AGTTCCTG(A,G)G3′ (SEQ ID NO:44) CL17B:5′ATGAAGTACTCTGCTCAGTTTCTAGG3′ (SEQ ID NO:45) CL17C:5′ATGAGGCATTCTCTTCAATTCTTGGG3′ (SEQ ID NO:46)

[0157] Each of the above primers has the sequence5′GGACTGTTCGAAGCCGCCACC3′ (SEQ ID NO:47) added to its 5′ end. TABLE 3Oligonucleotide primers for the 3′ ends of mouse Vh and Vl genes. Lightchain (CL12): 5′GGATACAGTTGGTGCAGCATCCGTACGTTT3′ (SEQ ID NO:48) Heavychain(R2155): 5′GCAGATGGGCCCTTCGTTGAGGCTG(A,C)(A,G)GAGAC(G,T,A)GTGA3′(SEQ ID NO:49)

[0158] TABLE 4 a) 5′ Primer mixtures for light chain PCR reactions pool1: CL2. pool 2: CL7. pool 3: CL13. pool 4: CL6. pool 5: CL5A, CL9,CL17A. pool 6: CL8. pool 7: CL12A. pool 8: CL1, CL3, CL4, CL5, CL10,CL11, CL2B, CL14, CL15, CL16, CL17B, CL17C b) 5′ Primer mixtures forheavy chain PCR reactions pool 1: CH1, CH2, CH3, CH4. pool 2: CH5, CH6,CH7, CH8. pool 3: CH9, CH10, CH11, CH12.

[0159] TABLE 5 Primers used in nucleotide sequence analysis R1053:5′GCTGACAGACTAACAGACTGTTCC3′ (SEQ ID NO:50) R720: 5′GCTCTCGGAGGTGCTCCT3′(SEQ ID NO:51)

[0160] Evaluation of Activities of Chimeric Genes

[0161] The activities of the chimeric genes were evaluated by expressingthem in mammalian cells and purifying and quantitating the newlysynthesised antibodies. The methodology for this is described below,followed by a description of the biochemical and cell based assays usedfor the biological characterisation of the antibodies.

[0162] a) Production of Chimeric hTNF40 Antibody Molecule

[0163] Chimeric antibody for biological evaluation was produced bytransient expression of the appropriate heavy and light chain pairsafter co-transfection into Chinese Hamster Ovary (CHO) cells usingcalcium phosphate precipitation.

[0164] On the day prior to transfection, semi-confluent flasks ofCHO-L761 cells were trypsinised, the cells counted and T75 flasks set upeach with 10⁷ cells.

[0165] On the next day, the culture medium was changed 3 hours beforetransfection. For transfection, the calcium phosphate precipitate wasprepared by mixing 1.25 ml of 0.25 M CaCl₂ containing 50 μg of each ofheavy and light chain expression vectors with 1.25 ml of 2×HBS (16.36 gNaCl, 11.0 g HEPES and 0.4 g Na₂HPO₄ in 1 liter water with the pHadjusted to 7.1 with NaOH) and adding immediately into the medium of thecells. After 3 hours at 37° C. in a CO₂ incubator, the medium andprecipitate were removed and the cells shocked by the addition of 15 ml15% glycerol in phosphate buffered saline (PBS) for 1 minute. Theglycerol was removed, the cells washed once with PBS and incubated for48-96 hours in 25 ml medium containing 10 mM sodium butyrate. Antibodycould be purified from the culture medium by binding to and elution fromprotein A-Sepharose.

[0166] b) ELISA

[0167] For the ELISA, Nunc ELISA plates were coated overnight at 4° C.with a F(ab)₂ fragment of a polyclonal goat anti-human Fc fragmentspecific antibody (Jackson Immunoresearch, code 109-006-098) at 5 μg/mlin coating buffer (15 mM sodium carbonate, 35 mM sodium hydrogencarbonate, pH 6.9). Uncoated antibody was removed by washing 5 timeswith distilled water. Samples and purified standards to be quantitatedwere diluted to approximately 1 μg/ml in conjugate buffer (0.1 MTris-HCl, pH 7.0, 0.1 M NaCl, 0.2% v/v Tween 20, 0.2% w/v Hammerstencasein). The samples were titrated in the microtitre wells in 2-folddilutions to give a final volume of 0.1 ml in each well and the platesincubated at room temperature for 1 hour with shaking. After the firstincubation step the plates were washed 10 times with distilled water andthen incubated for 1 hour as before with 0.1 ml of a mouse monoclonalanti-human kappa (clone GD12) peroxidase conjugated antibody (TheBinding Site, code MP135) at a dilution of 1 in 700 in conjugate buffer.The plate was washed again and substrate solution (0.1 ml) added to eachwell. Substrate solution contained 150 μl N,N,N,N-tetramethylbenzidine(10 mg/ml in DMSO), 150 μl hydrogen peroxide (30% solution) in 10 ml 0.1M sodium acetate/sodium citrate, pH 6.0. The plate was developed for5-10 minutes until the absorbance at 630 nm was approximately 1.0 forthe top standard. Absorbance at 630 nm was measured using a plate readerand the concentration of the sample determined by comparing thetitration curves with those of the standard.

[0168] c) Determination of Affinity constants by BiaCore analysis.

[0169] The binding interaction between hTNF40 and human TNF wasinvestigated using BIA technology. An affinity purified goat polyclonalantibody, directed against the constant region of hTNF40, wasimmobilised on the dextran polymer sensor chip surface using standardNHS/EDC chemistry. Relatively low levels (200-500 RU) of hTNF40 werecaptured to ensure mass transport effects were minimised. Human TNF atdifferent concentrations was passed over the captured hTNF40 to allowassessment of the association kinetics. Following the injection ofligand, buffer was passed over the surface so that the dissociationcould be measured. The association and dissociation rate constants forthe interaction between solid phase hTNF40 and human TNF werecalculated, and a K_(D) value was derived.

Example 1

[0170] CDR-Grafting of hTNF40

[0171] The molecular cloning of genes for the variable regions of theheavy and light chains of the hTNF40 antibody and their use to producechimeric (mouse-human) hTNF40 antibodies has been described above. Thenucleotide and amino acid sequences of the murine hTNF40 V1 and Vh areshown in FIGS. 6 and 7 (SEQ ID NOS:99 and 100), respectively. Thisexample describes the CDR-grafting of the hTNF40 antibody.

[0172] CDR-Grafting of hTNF40 Light Chain

[0173] Alignment of the framework regions of hTNF40 light chain withthose of the four human light chain subgroups (Kabat et al., 1991,supra) revealed that hTNF40 was most homologous to antibodies in humanlight chain subgroup 1. Consequently, for constructing the CDR-graftedlight chain, the framework regions chosen corresponded to those of thehuman group 1 consensus sequence.

[0174] A comparison of the amino acid sequences of the framework regionsof murine hTNF40 and the consensus human group 1 light chains is givenin FIG. 1 and shows that there are 22 differences (underlined) betweenthe two sequences. Analysis of the contribution that any of theseframework differences might have on antigen binding identified 2residues for investigation; these are at positions 46 and 60. Based onthis analysis, two versions of the CDR-grafted light chain wereconstructed. In the first of these, hTNF40-gL1 (SEQ ID NO:8), residues46 and 60 are derived from the hTNF40 light chain while in the second,hTNF40-gL2 (SEQ ID NO:9), all residues are human consensus exceptresidue number 60 which is from the hTNF40 light chain.

[0175] Construction of CDR-Grafted Light Chain hTNF40-gL1.

[0176] The construction of hTNF40-gL1 is given below in detail. Thefollowing overlapping oligonucleotides (P7982-P7986) were used in thePolymerase Chain Reactions (PCR) to assemble a truncated grafted lightchain. The assembled fragment lacks the antibody leader sequence and thefirst 17 amino acids of framework 1. oligo 1 P7982:5′GAATTCAGGGTCACCATCACTTGTAAAGCCAGTCAGAACGTAGGTACTAAC (SEQ ID NO:52)GTAGCCTGGTATCAGCAAA3′ oligo 2 P7983:5′ATAGAGGAAAGAGGCACTGTAGATGAGGGCTTTTGGGGCTTTACCTGGTTT (SEQ ID NO:53)TTGCTGATACCAGGCTACGT3′ oligo 3 P7984:5′TACAGTGCCTCTTTCCTCTATAGTGGTGTACCATACAGGTTCAGCGGATCCG (SEQ ID NO:54)GTAGTGGTACTGATTTCAC3′ oligo 4 P79855′GACAGTAATAAGTGGCGAAATCTTCTGGCTGGAGGCTACTGA (SEQ ID NO:55)TCGTGAGGGTGAAATCAGTACCACTACCG3′ oligo 5 P7986:5′ATTTCGCCACTTATTACTGTCAAGAGTATAACATCTACCCACT (SEQ ID NO:56)CACATTCGGTCAGGGTACTAAAGTAGAAATCAAACGTACGGAATTC3′ Fwd P7981:5′GAATTCAGGGTCACCATCACTTGTAAAGCC3′ (SEQ ID NO:57) Bwd P79805′GAATTCCGTACGTTTGATTTCTACTTTAGT3′ (SEQ ID NO:58),

[0177] A PCR reaction, 100 μl, was set up containing, 10 mM Tris-HCl pH8.3, 1.5 mM MgCl₂, 50 mM KCl, 0.01% w/v gelatin, 0.25 mM eachdeoxyribonucleoside triphosphate, 2 pmoles of P7982, P7983, P7984,P7985, P7986, 10 pmoles of P7980, P7981 and 1 unit of Taq polymerase.Reactions were cycled through 94° C. for 1 minute, 55° C. for 1 minuteand 72° C for 1 minute. After 30 cycles, each reaction was analysed byelectrophoresis on an agarose gel and the PCR fragment excised from thegel and recovered using a Mermaid Kit. The recovered fragment wasrestricted with the enzymes BstEll and SplI in the appropriate buffer.The resulting product was finally electrophoresed on an agarose gel andthe 270 base pair DNA fragment recovered from a gel slice and ligatedinto vector CTIL5-gL6 (FIG. 12), that had previously been digested withthe same enzymes. The above vector provides the missing antibody leadersequence and the first 17 amino acids of framework 1.

[0178] The ligation mixture was used to transform E. coli strain LM1035and resulting colonies analysed by PCR, restriction enzyme digests andnucleotide sequencing. The nucleotide and amino acid sequence of the V1region of hTNF40-gL1 is shown in FIG. 8 (SEQ ID NO:8).

[0179] Construction of CDR-Grafted Light Chain hTNF40-gL2.

[0180] hTNF40-gL2 (SEQ ID NO:9) was constructed using PCR. The followingoligonucleotides were used to introduce the amino acid changes: R1053:5′GCTGACAGACTAACAGACTGTTCC3′ (SEQ ID NO:59) R5350:5′TCTAGATGGCACACCATCTGCTAAGTTTGATGCAGCATAGAT (SEQ ID NO:60)CAGGAGCTTAGGAGC3′ R5349: 5′GCAGATGGTGTGCCATCTAGATTCAGTGGCAGTGGATCA (SEQID NO:61) GGCACAGACTTTACCCTAAC3′ R684: 5′TTCAACTGCTCATCAGAT3′ (SEQ IDNO:62)

[0181] Two reactions, each 20 μl, were set up each containing 10 mMTris-HCl pH 8.3, 1.5 mM MgCl₂, 50 mM KCl, 0.01% w/v gelatin, 0.25 mMeach deoxyribonucleoside triphosphate, 0.1 μg hTNF40-gL1, 6 pmoles ofR1053/R5350 or R5349/R684 and 0.25 units Taq polymerase. Reactions werecycled through 94° C. for 1 minute, 55° C. for 1 minute and 72° C. for 1minute. After 30 cycles, each reaction was analysed by electrophoresison an agarose gel and the PCR fragments excised from the gel andrecovered using a Mermaid Kit.

[0182] Aliquots of these were then subjected to a second round of PCR.The reaction, 100 μl, contained 10 mM Tris-HCl pH 8.3, 1.5 mM MgCl₂, 50MM KCl, 0.01% w/v gelatin, ⅕ of each of the PCR fragments from the firstset of reactions, 30 pmoles of R1053 and R684 and 2.5 units Taqpolymerase. Reaction temperatures were as above. After the PCR, themixture was extracted with phenol/chloroform and then with chloroformand precipitated with ethanol. The ethanol precipitate was recovered bycentrifugation, dissolved in the appropriate buffer and restricted withthe enzymes BstEII and SplI. The resulting product was finallyelectrophoresed on an agarose gel and the 270 base pair DNA fragmentrecovered from a gel slice and ligated into the vector pMR15.1 (FIG. 4)that had previously been digested with the same enzymes.

[0183] The ligation mixture was used to transform E. coli LM1035 andresulting colonies analysed by PCR, restriction enzyme digests andnucleotide sequencing. The nucleotide and amino acid sequence of the V1region of hTNF40-glL2 is shown in FIG. 9 (SEQ ID NO:9).

[0184] CDR-Grafting of hTNF40 Heavy Chain

[0185] CDR-grafting of hTNF40 heavy chain was accomplished using thesame strategy as described for the light chain. hTNF40 heavy chain wasfound to be most homologous to human heavy chains belonging to subgroup1 and therefore the consensus sequence of the human subgroup 1frameworks was chosen to accept the hTNF40 heavy chain CDRs.

[0186] To investigate the requirement of a homologous human framework toact as an acceptor framework for CDR grafting, a second framework, humangroup 3, was selected to humanise hTNF40 heavy chain.

[0187] A comparison of hTNF40 with the two different frameworks regionis shown in FIG. 2 where it can be seen that hTNF40 differs from thehuman subgroup 1 consensus at 32 positions (underlined) (FIG. 2) anddiffers from the human subgroup 3 consensus at 40 positions (underlined)(FIG. 2). After analysis of the contribution that any of these mightmake to antigen binding, residues 28, 38, 46, 67, 69 and 71 wereretained as donor in the CDR-grafted heavy chain gh1hTNF40.1, using thegroup 1 framework. Residues 27, 28, 30, 48, 49, 69, 71, 73, 76 and 78were retained as donor in the CDR-grafted heavy chain, gh3hTNF40.4 usingthe group 3 framework. Residues 28, 69 and 71 were retained as donor inthe CDR-grafted heavy chain, gh1hTNF40.4 using the group 1 framework.

[0188] Construction of CDR-Grafted Heavy Chain gh1hTNF40.4

[0189] gh1 hTNF40.4 (SEQ ID NO:10) was assembled by subjectingoverlapping oligonucleotides to PCR in the presence of the appropriateprimers. The following oligonucleotides were used in the PCR: Group 1graft oligo 1 P7989: 5′GAAGCACCAGGCTTCTTAACCTCTGCTCCTGACTGGACCAGC (SEQID NO:63) TGCACCTGAGAGTGCACGAATTC3′ oligo 2 P7990:5′GGTTAAGAAGCCTGGTGCTTCCGTCAAAGTTTCGTGTAAGGC (SEQ ID NO:64)CTCAGGCTACGTGTTCACAGACTATGGTA3′ oligo 3 P7991:5′CCAACCCATCCATTTCAGGCCTTGTCCCGGGGCCTGCTTGACC (SEQ ID NO:65)CAATTCATACCATAGTCTGTGAACACGT3′ oligo 4 P7995:5′GGCCTGAAATGGATGGGTTGGATTAATACTTACATTGGAGAG (SEQ ID NO:66)CCTATTTATGTTGACGACTTCAAGGGCAGATTCACGTTC3′ oligo 5 P7992:5′CCATGTATGCAGTGCGTTGTGGAGGTGTCTAGAGTGAACGTG (SEQ ID NO:67)AATCTGCCCTTGAA3′ oligo 6 P7993:5′CCACAAGCACTGCATACATGGAGCTGTCATCTCTGAGATCCG (SEQ ID NO:68)AGGACACCGCAGTGTACTAT3′ oligo 7 P7994:5′GAATTCGGTACCCTGGCCCCAGTAGTCCATGGCATAAGATCT (SEQ ID NO:69)GTATCCTCTAGCACAATAGTACACTGCGGTGTCCTC3′ Fwd: P7988:5′GAATTCGTGCACTCTCAGGTGCAGCTGGTC3′ (SEQ ID NO:70) BwdP 7987:5′GAATTCGGTACCCTGGCCCCAGTAGTCCCAT3′ (SEQ ID NO:71)

[0190] The assembly reaction, 100 μl, contained 10 mM Tris-HCl pH 8.3,1.5 mM MgCl₂, 50 mM KCl, 0.01% w/v gelatin, 0.25 mM eachdeoxyribonucleoside triphosphate, 2 pmole of each of p7989, p7990,p7991, p7995, p7992, p7993 and p7994, 10 pmoles of each of p7988 andp7987 and 1 unit Taq polymerase. Reactions were cycled through 94° C.for 1 minute, 55° C. for 1 minute and 72° C. for 1 minute. After 30cycles, the reaction was extracted with phenol/chloroform (1/1), thenwith chloroform and precipitated with ethanol. After centrifugation, theDNA was dissolved in the appropriate restriction buffer and digestedwith ApaLI and KpnI. The resulting fragment was isolated from an agarosegel and ligated into pMR14 (FIG. 5) that had previously been digestedwith the same enzymes. pMR14 contains the human gamma 4 heavy chainconstant region when pMR14 is cleaved with ApaLI and Kpnl, the cleavedvector is able to receive the digested DNA such that the 3′ end of thedigested DNA joins in reading frame to the 5′ end of the sequenceencoding the gamma 4 constant region. Therefore, the heavy chainexpressed from this vector will be a gamma 4 isotype. The ligationmixture was used to transform E. coli LM1035 and resulting bacterialcolonies screened by restriction digest and nucleotide sequenceanalysis. In this way, a plasmid was identified containing the correctsequence for gh1hTNF40.4 (FIG. 10) (SEQ ID NO:10).

[0191] Construction of CDR-Grafted Heavy Chain gh3hTNF40.4

[0192] gh3hTNF40.4 (SEQ ID NO:11) was assembled by subjectingoverlapping oligonucleotides to PCR in the presence of the appropriateprimers. The following oligonucleotides were used in the PCR: Group 3graft oligo 1 P7999: 5′GATCCGCCAGGCTGCACGAGACCGCCTCCTGACTCGACCAGC (SEQID NO:72) TGAACCTCAGAGTGCACGAATTC3′ oligo 2 P8000:5′TCTCGTGCAGCCTGGCGGATCGCTGAGATTGTCCTGTGCTGC (SEQ ID NO:73)ATCTGGTTACGTCTTCACAGACTATGGAA3′ oligo 3 P80015′CCAACCCATCCATTTCAGGCCCTTTCCCGGGGCCTGCTTAACC (SEQ ID NO:74)CAATTCATTCCATAGTCTGTGAAGACGT3′ oligo 4 P7995:5′GGCCTGAAATGGATGGGTTGGATTAATACTTACATTGGAGAG (SEQ ID NO:66)CCTATTTATGTTGACGACTTCAAGGGCAGATTCACGTTC3′ oligo 5 P7997:5′GGAGGTATGCTGTTGACTTGGATGTGTCTAGAGAGAACGTGA (SEQ ID NO:75)ATCTGCCCTTGAA3′ oligo 6 P7998:5′CCAAGTCAACAGCATACCTCCAAATGAATAGCCTGAGAGCA (SEQ ID NO:76)GAGGACACCGCAGTGTACTAT3′ oligo 7 P7993:5′GAATTCGGTACCCTGGCCCCAGTAGTCCATGGCATAAGATCT (SEQ ID NO:77)GTATCCTCTAGCACAATAGTACACTGCGGTGTCCTC3′ Fwd P7996:5′GAATTCGTGCACTCTGAGGTTCAGCTGGTC3′ (SEQ ID NO:78) Bwd P7987:5′GAATTCGGTACCCTGGCCCCAGTAGTCCAT3′ (SEQ ID NO:71)

[0193] The assembly reaction, 100 μl, contained 10 mM Tris-HCl pH 8.3,1.5 mM MgCl₂, 50 mM KCl, 0.01% w/v gelatin, 0.25 mM eachdeoxyribonucleoside triphosphate, 2 pmole of each of p7999, p8000,p8001, p7995, p7997, p7998 and p7993, 10 pmoles of each of p7996 andp7987 and 1 unit Taq polymerase. Reactions were cycled through 94° C.for 1 minute, 55° C. for 1 minute and 72° C. for 1 minute. After 30cycles, the reaction was extracted with phenol/chloroform (1/1), thenwith chloroform and precipitated with ethanol. After centrifugation, theDNA was dissolved in the appropriate restriction buffer and digestedwith ApaLI and KpnI. The resulting fragment was isolated from an agarosegel and ligated into pMR14 (FIG. 5) that had previously been digestedwith the same enzymes. pMR14 contained the human gamma 4 heavy chainconstant region. When pMR14 is cleaved with ApaLI and KpnI, the cleavedvector is able to receive the digested DNA such that the 3′ end of thedigested DNA joins in reading frame to the 5′ end of the sequenceencoding the gamma 4 constant region. Therefore, the heavy chainexpressed from this vector will be a gamma 4 isotype. The ligationmixture was used to transform E. coli LM1035 and resulting bacterialcolonies screened by restriction digestion and nucleotide sequenceanalysis. In this way, a plasmid was identified containing the correctsequence for gh3hTNF40.4 (SEQ ID NO:11) (FIG. 11).

[0194] Production of CDR-Grafted Modified Fab Fragment.

[0195] A CDR-grafted, modified Fab fragment, based on antibody hTNF40,was constructed using the E. coli vector pTTO-1. The variable regions ofantibody hTNF40 are sub-cloned into this vector and the intergenicsequence optimised to create pTTO(CDP870). The pTTO expression vector isdesigned to give rise to soluble, periplasmic accumulation ofrecombinant proteins in E. coli. The main features of this plasmid are:

[0196] (i) tetracycline resistance marker—antibiotic not inactivated bythe product of resistance gene, hence selection for plasmid-containingcells is maintained;

[0197] (ii) low copy number—origin of replication derived from plasmidpl5A, which is compatible with plasmids containing co1E11 derivedreplicons;

[0198] (iii) strong, inducible tac promoter for trancription of clonedgene(s);

[0199] (iv) lacI^(q) gene—gives constitutive expression of the lacrepressor protein, maintaining the tac promoter in the repressed stateuntil induction with IPTG/allolactose;

[0200] (v) OmpA signal sequence—gives periplasmic secretion of clonedgene(s); and

[0201] (vi) translational coupling of OmpA signal sequence to a shortlacZ peptide, giving efficient initiation of translation.

[0202] The vector has been developed for expression of modified Fabfragments from a dicistronic message by the design of a method to selectempirically the optimum intergenic sequence from a series of fourpurpose-built cassettes. The application of this in the construction ofpTTO(CDP870) is described.

[0203] Materials and Methods

[0204] DNA techniques

[0205] Standard procedures were used for protocols including DNArestriction, agarose gel electrophoresis, ligation and transformation.Restriction enzymes and DNA modifying enzymes were obtained from NewEngland Biolabs or Boehringer Mannheim, and were used according to thesupplier's recommendations. DNA fragments were purified from agaroseusing the GeneClean protocol (BIO 101). Oligonucleotides were suppliedby Oswel Oligonucleotide Service and were synthesized at the 40 nmscale. Plasmid DNA was isolated using Plasmid DNA Mini/Midi kits fromQiagen. PCR was performed using Perkin Elmer ‘Amplitaq’ as recommended.DNA sequencing was performed using the Applied Biosystems Taq cyclesequencing kit.

[0206] Shake flask induction

[0207]E. coli W3110 cultures were grown in L-broth supplemented withtetracycline (7.5 μg/ml). For inductions, fresh overnight cultures(grown at 30° C.) were diluted to OD₆₀₀ of 0.1 into 200 ml L-broth in a2 L baffled flask and were grown at 30° C. in an orbital incubator. AtOD₆₀₀ of 0.5, IPTG was added to 200 μM. Samples (normalised for OD) weretaken at intervals.

[0208] Periplasmic Extraction

[0209] Culture samples were chilled on ice (5 minutes) then cells wereharvested by centrifugation. Following resuspension in extraction buffer(100 mM Tris-HCl, 10 mM EDTA, pH 7.4) samples were incubated overnightat 30° C., then clarified by centrifugation.

[0210] Assembly Assay

[0211] Modified Fab concentrations were determined by ELISA. Plates werecoated at 4° C. overnight with anti-human Fd 6045 (2 μg/ml in coatingbuffer, physiological saline, 100 μl per well). After washing, 100 μl ofsample was loaded per well; purified A5B7 gamma-i Fab′, initially at 2μg/ml, was used as a standard. Samples were serially diluted 2-foldacross the plate in sample conjugate buffer (per liter: 6.05 gtrisaminomethane; 2.92 g NaCl; 0.1 ml Tween-20; 1 ml casein (0.2%));plates were incubated for 1 hour at room temperature, with agitation.Plates were washed and dried, then 100 μl of anti-human C-kappa(GD12)-peroxidase was added (diluted in sample conjugate buffer).Incubation was carried out at room temperature for 1 hour withagitation. Plates were washed and dried, then 100 μl of substratesolution was added (10 ml sodium acetate/citrate solution (0.1 M pH 6);100 μl H₂O₂ solution; 100 μl tetramethylbenzidine solution (10 mg/ml indimethylsulphoxide)). Absorbance at 630 nm was read 4-6 minutes aftersubstrate addition.

[0212] Construction of Plasmid pTTO-1

[0213] (a) Replacement of the pTTQ9 Polylinker

[0214] Plasmid pTTQ9 was obtained from Amersham and is shown in FIG. 14.An aliquot (2 μg) was digested with restriction enzymes SalI and EcoRI,the digest was run on a 1% agarose gel and the large DNA fragment (4520bp) was purified. Two oligonucleotides were synthesized which, whenannealed together, encode the OmpA polylinker region shown in FIG. 15.This sequence has cohesive ends which are compatible with the SalI andEcoRI ends generated by restriction of pTTQ9. By cloning thisoligonucleotide ‘cassette’ into the pTTQ9 vector, the SalI site is notregenerated, but the EcoRI site is maintained. The cassette encodes thefirst 13 amino acids of the signal sequence of the E. coliouter-membrane protein Omp-A, preceded by the Shine Dalgarno ribosomebinding site of the OmpA gene. In addition restriction sites for enzymesXbaI, MunI, StyI and SplI are present. The MunI and StyI sites arewithin the coding region of the OmpA signal sequence and are intended asthe 5′ cloning sites for insertion of genes. The two oligonucleotideswhich make up this cassette were annealed together by mixing at aconcentration of 5 pmoles/μl and heating in a waterbath to 95° C. for 3minutes, then slow cooling to room temperature. The annealed sequencewas then ligated into the SalI/EcoRI cut pTTQ9. The resulting plasmidintermediate, termed pTQOmp, was verified by DNA sequencing.

[0215] (b) Fragment Preparation and Ligation

[0216] Plasmid pTTO-1 was constructed by ligating one DNA fragment fromplasmid pACYC184 to two fragments generated from pTQOmp. PlasmidpACYC184 was obtained from New England Biolabs, and a restriction map isshown in FIG. 16. An aliquot (2 μg) was digested to completion withrestriction enzyme StyI, then treated with Mung Bean Nuclease; thistreatment creates blunt ends by cutting back 5′ base overhangs.Following phenol extraction and ethanol precipitation, the DNA wasrestricted with enzyme PvuII, generating fragments of 2348, 1081, 412and 403 bp. The 2348 bp fragment was purified after agarose gelelectrophoresis. This fragment encodes the tetracycline resistancemarker and the p15A origin of replication. The fragment was then treatedwith calf intestinal alkaline phosphatase to remove 5′ terminalphosphates, thereby preventing the self-ligation of this molecule.

[0217] An aliquot (2 μg) of plasmid pTQOmp was digested with enzymesSspI and EcoRI, and the 2350 bp fragment was purified from unwantedfragments of 2040 bp and 170 bp following agarose gel electrophoresis;this fragment encodes the transcriptional terminator region and thelaclq gene. Another aliquot (2 μg) of pTQOmp was digested with EcoRI andXmnI, generating fragments of 2289, 1670, 350 and 250 bp. The 350 bpfragment, encoding the tac promoter, OmpA signal sequence andmulticloning site, was gel purified.

[0218] The three fragments were then ligated, using approximatelyequimolar amounts of each fragment, to generate the plasmid pTTO-1. Allcloning junctions were verified by DNA sequencing. The restriction mapof this plasmid is shown in FIG. 17. Plasmid pTTO-2 was then created byinsertion of DNA encoding the human Ig light chain kappa constantdomain. This was obtained as a SplI-EcoRI restriction fragment fromplasmid pHC132, and inserted into the corresponding sites in pTTO-1.Plasmid pTTO-2 is shown in FIG. 18.

[0219] Insertion of humanized hTNF40 variable regions into pTTO-2

[0220] The variable light chain region hTNF40gL1 (SEQ ID NO:8) wasobtained by PCR ‘rescue’ from the corresponding vector for mammaliancell expression pMR10.1. The OmpA leader sequence replaces the native Igleader. The sequence of the PCR primers is shown below: 5′ primer:CGCGCGGCAATTGCAGTGGCCTTGGCTGGTTTCGCTACCGTAG (SEQ ID NO:79)CGCAAGCTGACATTCAAATGACCCAGAGCCC 3′ primer: TTCAACTGCTCATCAGATGG (SEQ IDNO:80)

[0221] Following PCR under standard conditions, the product waspurified, digested with enzymes MunI and SplI then gel purified. Thepurified fragment was then inserted into the MunI/SplI sites of pTTO-2to create the light chain intermediate pTTO(hTNF40L).

[0222] The variable heavy chain region of gh3hTNF40.4 was obtained inthe same way from the vector pGamma-4. The sequence of the PCR primersis shown below: 5′ primer: (SEQ ID NO:81)GCTATCGCAATTGCAGTGGCGCTAGCTGGTTTCGCCACCGTGGCGCAAGCTGAGGTTCAGCTGGTCGAGTCAGGAGGC 3′ primer: GCCTGAGTTCCACGACAC (SEQID NO:82)

[0223] Following PCR the product was purified, digested with enzymesNheI and ApaI then sub-cloned into the vector pDNAbEng-G1 (FIG. 19).After verification by DNA sequencing, the heavy chain was restrictedwith enzyme EcoRI and sub-cloned into the EcoRI site of pTTO(hTNF40L) tocreate the E. coli expression plasmid pTTO(hTNF40).

[0224] Optimisation of Intergenic Sequence for Modified Fab Expression

[0225] In the pTTO vector, modified Fab expression occurs from adicistronic message encoding first light chain then heavy chain. The DNAsequence between the two genes (intergenic sequence, IGS) can influencethe level of expression of the heavy chain by affecting the rate oftranslational initiation. For example, a short intergenic sequence mayresult in translational coupling between the light and heavy chains, inthat the translating ribosome may not fully dissociate from the mRNAafter completing light chain synthesis before initiating heavy chainsynthesis. The ‘strength’ of any Shine Dalgamo (SD) ribosome bindingsite (homology to 16S rRNA) can also have an effect, as can the distanceand sequence composition between the SD and the ATG start codon. Thepotential secondary structure of MRNA around the ATG is anotherimportant factor; the ATG should be in a ‘loop’ and not constrainedwithin a ‘stem’, while the reverse applies to the SD. Thus by modifyingthe composition and length of the IGS it is possible to modify thestrength of translational initiation and therefore the level of heavychain production. It is likely that an optimum rate of translationalinitiation needs to be achieved to maximise expression of the heavychain of a given modified Fab. For example, with one modified Fab, ahigh level of expression may be tolerated, but for a different modifiedFab with different amino acid sequence, a high level of expression mightprove toxic, perhaps because of different efficiencies of secretion orfolding. For this reason, a series of four intergenic sequences weredesigned (FIG. 20), permitting the empirical determination of theoptimum IGS for the hTNF40-based modified Fab. IGS1 and IGS2 have veryshort intergenic sequences (−1 and +1 respectively) and might beexpected to give closely coupled translation; the SD sequences(underlined) are subtly different. These two sequences will most likelyconfer a high level of translational initiation. IGS3 and IGS4 have alonger distance between start and stop codons (+13) and differ in theirsequence composition; IGS3 has a ‘stronger’ SD sequence. All sequenceswere studied for secondary structure (using m/fold program) and‘optimised’ as far as possible; however, with tight coupling oftranslation of the two chains the lack of ribosomal dissociation meansthat the mRNA may not be ‘naked’, preventing secondary structureformation.

[0226] Cloning of IGS variants

[0227] The IGS cassettes shown in FIG. 20 have flanking SacI and MunIcloning sites. They were built by annealing complementaryoligonucleotide pairs. A vector fragment was prepared by digestingpTTO(hTNF40) with SacI and NotI, and a heavy chain fragment was preparedby digesting pDNAbEngGl(hTNF40H) with MunI and NotI. Three-way ligationswere then performed, using equimolar amounts of the two restrictionfragments and approximately 0.05 pmoles of each annealed oligo cassette.This created the four expression plasmids pTTO(hTNF40 IGS-1),pTTO(hTNF40 IGS-2), pTTO(hTNF40 IGS-3), pTTO(hTNF40 IGS-4).

[0228] Shake flask expression analysis

[0229] The four plasmids were transformed into E. Coli strain W3110,along with the original expression construct, and then analysed forexpression in shake flasks as described. The results of a typicalexperiment are shown in FIG. 21. The different intergenic sequencesconfer different expression profiles. IGS1 and IGS2 accumulateperiplasmic modified Fab rapidly with a peak at 1 hour post induction,after which the level recovered falls. The peak is greater and the fallsharper for IGS1. These results are consistent with a high level ofsynthesis, as expected for close translational coupling for theseconstructs. IGS1 apparently confers a higher level of heavy chainexpression than does IGS2. In this instance, it appears that this highlevel of expression is poorly tolerated, since periplasmic expressionlevels fall after the 1 hour peak. This is seen on the growth profile ofthe IGS1 culture (not shown), which peaks at 1 hour post inductionbefore falling, suggesting cell death and lysis. IGS3 accumulatesmodified Fab more slowly but peaks at 2 hours post induction with ahigher peak value (325 ng/ml/OD), before levels fall. The growth of thisculture continued to 3 hours post induction and reached a higher peakbiomass (not shown). This is consistent with a lower level of heavychain synthesis. IGS4 accumulates material at a slower rate still andfails to reach the high peak of productivity of the other 3 constructs.All IGS variants out-perform the original vector significantly. Thehypothesis that the different IGS sequences confer different rates oftranslational initiation is supported by these experimental results. Forthe hTNF40-based modified Fab it appears that a high rate of heavy chaintranslational initiation is poorly tolerated and is therefore notoptimal. A slower rate, as conferred by IGS3, results in better growthcharacteristics and consequently a better yield accumulates over time.

[0230] Following comparison of productivity in the fermenter the IGS3construct was selected as the highest yielding and was termedpTTO(CDP870)—see FIG. 22.

[0231] The heavy chain encoded by the plasmid pTTO(CDP870) has thesequence given in SEQ ID NO:115 and the light chain has the sequencegiven in SEQ ID NO:113.

[0232] PEGylation of CDR-Grafted, hTNF40-based Modified Fab.

[0233] The purified modified Fab is site-specifically conjugated with abranched molecule of PEG. This is achieved by activation of a singlecysteine residue in a truncated hinge region of the modified Fab,followed by reaction with (PEG)-lysyl maleimide as previously described(A. P. Chapman et al., Nature Biotechnology 17, 780-783, 1999). ThePEGylated molecule is shown in FIG. 13 and is called compound CDP870.

[0234] Efficacy of PEGylated CDR-Grafted, hTNF40-based Modified Fab(CDP870) in Treating Rheumatoid Arthritis.

[0235] CDP870 has a long half life of approximately 11 days.

[0236] We evaluated the safety and efficacy of intravenous CDP870 in arandomised double-blind placebo-controlled dose escalating trial inpatients with RA.

[0237] Methods

[0238] Patients:

[0239] Patients aged between 18 and 75 years old and who satisfied the1987 revised American College of Rheumatology (ACR) diagnostic criteriafor rheumatoid arthritis (RA) (Amett et al., Arthritis Rheum., 31,315-324, 1988) were recruited from outpatient Rheumatology clinics atLondon, Cambridge, Norfolk and Norwich (United Kingdom). Patients wererequired to have clinically active disease as defined by having at least3 of the following criteria: ≧6 painful or tender joints; ≧45 minutes ofearly morning stiffness; and erythrocyte sedimentation rate (ESR) ≧28mr/hr. They must have failed to respond to at least one DiseaseModifying Anti-Rheumatic Drug (DRARD) and have been off treatment for atleast 4 weeks. Corticosteroids were permitted if the dose was ≧7.5mg/day of prednisolone. Pregnant women, nursing women and women ofchildbearing potential not using an effective method of contraceptionwere excluded. Patients were also excluded if they had a previoushistory of malignancy, concomitant severe uncontrolled medicalconditions, previous failure of TNFα-neutralizing therapy or allergy topolyethylene glycol. Written informed consent was obtained from eachpatient before enrolment. The study was approved by the local researchethics committees.

[0240] Treatment protocol:

[0241] 36 RA patients were divided into 3 groups, each to receive anincreasing dose of the trial drug (1, 5 or 20 mg/kg). Each group of 12was randomly divided into 8 to receive CDP870 and 4 to receive placebo.CDP870 was given as a single intravenous infusion (100 ml in total) over60 minutes. Placebo (sodium acetate buffer) was given similarly as asingle intravenous infusion of 100 ml over 60 minutes. Treatment wasgiven on an outpatient basis. After 8 weeks, all patients had theopportunity to receive an infusion of either 5 or 20 mg/kg of CDP870 inopen fashion.

[0242] Clinical assessment:

[0243] RA disease activity was assessed based on the World HealthOrganization and International League of Associations for Rheumatology(Boers et al., J. Rheumatol—Supplement, 41, 86-89, 1994) and EuropeanLeague Against Rheumatism (EULAR) (Scott et al., Clin. Exp. Rheumatol.,10, 521-525, 1992) core data sets with 28 joint counts. Changes indisease activity were assessed by Disease Activity Score (Prevoo et al.,Arthritis Rheum., 38, 44-48, 1995) and the ACR responses criteria(Felson et al., Arthritis Rheum., 38, 727-735, 1995). Assessments werecarried out before treatment and at 1, 2, 4, 6 and 8 weeks aftertherapy. Patients were also assessed for safety and tolerance of thestudy drug. Haematology, biochemistry, anti-CDP870 antibodies andadverse events were assessed at each visit.

[0244] CDP870plasma concentration and anti-CDP870 antibodies:

[0245] CDP870 was measured by enzyme-linked immunosorbent assay (ELISA).Serial dilutions of patients' plasma were incubated in microtitre plates(Nunc) coated with recombinant human TNFα: (Strathmann Biotech GmbH,Hannover). Captured CDP870 was revealed with horseradish peroxidaseconjugated goat anti-human kappa light chain (Cappel, ICN) followed bytetramethylbenzidine (TMB) substrate.

[0246] Antibodies to CDP870 was screened (at 1/10 plasma dilution) usinga double antigen sandwich ELISA with biotinylated CDP870 as the secondlayer. Bound antibodies were revealed using HRP-streptavidin and TMBsubstrate. The assay was calibrated using a hyperimmune rabbit IgGstandard. A unit of activity is equivalent to 1 μg of the rabbitstandard.

[0247] Statistical Analysis

[0248] The study was exploratory in nature and the sample size was basedon previous experience with similar agents. Efficacy of CDP870 wasanalysed by calculating disease activity score (DAS) and ACR20/50responses for intention to treat and per-protocol using a closed testingprocedure. The disease activity score was calculated as follows:DAS=0.555×square root of (28 tender joints)+0.284×square root of (28swollen joints)+0.7×In(ESR)+0.0142×(patient's global assessment). First,the pooled active groups were compared to placebo. If this comparisonwas significant at the 5% level, each dosage group was compared toplacebo. All comparisons were two tailed with a significance level of5%. All P-values were derived from exploratory analysis and should notbe used for inferential interpretation.

[0249] Results

[0250] Demography:

[0251] 36 patients with RA were recruited. Their demographic details aregiven in Table 6. The mean age was 56 years and 30 patients were female.The mean duration of RA was 13 years and 21 patients were rheumatoidfactor positive. Patients in the different groups have similardemographic characteristics. In the blinded dosing period, 6/12placebo-treated patients withdrew from the study for deteriorating RA>4,weeks after dosing. 2/24 CDP870-treated patients withdrew, both in the 1mg/kg group, for deteriorating RA/lost to follow up >4 weeks afterdosing. The difference was statistically significant (p=0.009, Fisherexact test). TABLE 6 Demographic details (mean ± standard deviation)Number Duration Rheuma- of Num- Sex of toid previous ber (M:F) AgeDisease Factor DMARDs Placebo 12  1.11 51 ± 8 12 ± 8 8(67%) 5 ± 1  1mg/kg 8 1:7 59 ± 7 12 ± 7 4(50%) 4 ± 1  5 mg/kg 8 2:6  54 ± 13 13 ± 55(63%) 5 ± 2 20 mg/kg 8 2.6  61 ± 11  14 ± 13 4(50%) 4 ± 2

[0252] Clinical Efficacy:

[0253] The proportion of patients with ACR20 improvement for theper-protocol population with last observation carried forward was 16.7,50, 87.5 and 62.5% after placebo, 1, 5 and 20 mg/kg CDP870 (combinedtreatment effect p=0.012) at 4 weeks and 16.7, 25, 75 and 75% (p=0.032)at 8 weeks. Reduction in DAS scores (median) for the per-protocolpopulation with last observation carried forward was 0.15, 1.14, 1.91and 1.95 after placebo, 1, 5 and 20 mg/kg CDP870 (combined treatmenteffect p=0.001) at 4 weeks and 0.31, 0.09, 2.09 and 1.76 (p=0.008) at 8weeks (FIG. 23). Changes in individual components of the World HealthOrganization and International League of Associations for Rheumatologycore data set are shown in FIG. 24.

[0254] Following the open label dose of CDP870, similar beneficialeffects were achieved. Of the 36 patients recruited into the study, 32received a second infusion of CDP870. The proportion of patients withACR20 improvement from pre-first infusion was 72.2 and 55.6% after 5 and20 mg/kg CDP870 at 4 weeks and 55.6 and 66.7% at 8 weeks.

[0255] Adverse Events

[0256] Treatment was well tolerated with no infusion-related reaction.No allergic reaction or skin rash was reported. In the double-blindphase, there were 19, 38, 8 and 14 adverse events in the placebo, 1, 5and 20 mg/kg groups respectively. The commonest was headache with 9episodes in 5 patients (1 placebo, 3 at 1 mg/kg, 1 at 20 mg/kg). Onepatient who received placebo and 3 patients who received CDP870 (1 at 5mg/kg and 2 at 20 mg/kg) developed lower respiratory tract infections.These were reported as mild or moderate. They were treated with oralantibiotics and resolved over 1-2 week period. Three patients each inthe 1 and 5 mg/kg groups and one in the 20 mg/kg group developed aurinary tract infection 1-2 months after CDP870 treatment. One adverseevent was described as severe which was an episode of neck painoccurring 3 days after infusion with 1 mg/kg. Increase in anti-nuclearantibody was seen in 4 patients: 1 in the placebo group (negative to1/40), 2 in the 1 mg/kg group (negative to 1/40, negative to 1/80) and 1in the 20 mg/kg group (negative to 1/40). No change was found inanti-DNA or anti-cardiolipin antibodies.

[0257] CDP870 Plasma Concentration and Anti-CDP870 levels

[0258] As expected, for all dose levels of CDP870, the peak plasmaconcentration occurred at the end of infusion and was dose proportionalwith plasma concentration declining slowly thereafter. The plasmaconcentration profile of CDP870 appeared very similar to that previouslyobserved in volunteers where the half-life was calculated to beapproximately 14 days. On re-dosing, a similar profile to single doseinfusion was observed.

[0259] Following a single intravenous infusion, anti-CDP870 levels werelow or undetectable.

[0260] Discussion

[0261] Neutralizing TNFα is an effective treatment strategy in RA.Currently, this requires the use of biological agents, such as achimeric mAb or a soluble receptor/human Fc fusion protein, which areexpensive to manufacture. A therapeutic TNFa neutralizing agent needs tobind TNFα with high affinity and have a long plasma half-life, lowantigenicity and high tolerability and safety. It also needs to beaccessible to all patients with RA who would benefit from TNFα blockade.One technology that could achieve these objectives is the conjugationwith polyethylene glycol of a TNFα binding antibody fragment made in E.coli. In this preliminary study, we find that CDP870, a PEGylated,anti-TNFα, modified Fab, is effective and well tolerated by patientswith RA.

[0262] In vitro studies have shown that CDP870 has similar TNFαneutralizing activity to the murine anti-TNFα: parent antibody. Thisstudy confirms that CDP870 reduced inflammation and improved symptoms inRA. Clinical improvement as measured by the ACR20 response criteria inthe 5 and 20 mg/kg groups (75%, 75%) was comparable to etanercept (60%)(Moreland et al., Annals Int. Med., 130, 478-486, 1999) and infliximab(50%) (Maini et al., Lancet, 354, 1932-1939, 1999). At the middle andhighest dosage levels tested, the therapeutic effect lasted 8 weekswhich is comparable to previous other mAbs (Elliott et al., Lancet, 344,1105-1110, 1994 and Rankin et al., Br. J. Rheumatol., 34, 334-342,1995). Previous study has shown that the therapeutic effect of anti-TNFαantibody is related to its plasma half-life and the generation ofcirculating antibodies (Maini et al., Arthritis Rheum.38 (Supplement):S186 1995 (Abstract)). Our study showed that CDP870 has a plasmahalf-life of 14 days which is equivalent to that of a whole antibody(Rankin et al., (supra)) and much longer than the half-life ofunconjugated Fab′ fragments. Further, CDP870 generated only very lowlevels of antibody response.

[0263] One of the important objectives of this study is to examine thetolerability and safety of administering this PEGylated Fab′. In ourstudy, CDP870 appears well tolerated. Although further study will beneeded to assess long-term toxicity, especially the risk ofdemyelinating disease, infection and skin rashes that have been reportedwith etanercept and infliximab.

[0264] In summary, CDP870 is therapeutically effective in RA and waswell tolerated in this short-term study.

[0265] The complete content of all publications, patents and patentapplications cited in this description are herein incorporated byreference as if each individual publication, patent or patentapplication were specifically and individually indicated as beingincorporated by reference.

[0266] The foregoing invention has been described above in some detailby way of illustration and example for the purposes of clarity ofunderstanding. The above examples are provided for exemplificationpurposes only and are not intended to limit the scope of the invention,which has been described in broad terms before the examples. It will bereadily apparent to one skilled in the art in light of the teachings ofthis invention that changes and modifications can be made withoutdeparting from the spirit and scope of the present invention.

1 130 1 5 PRT Artificial Sequence hTNF40 CDRH1 1 Asp Tyr Gly Met Asn 1 52 17 PRT Artificial Sequence hTNF40/human hybrid CDRH2 2 Trp Ile Asn ThrTyr Ile Gly Glu Pro Ile Tyr Ala Asp Ser Val Lys 1 5 10 15 Gly 3 9 PRTArtificial Sequence hTNF40 CDRH3 3 Gly Tyr Arg Ser Tyr Ala Met Asp Tyr 15 4 11 PRT Artificial Sequence hTNF40 CDRL1 4 Lys Ala Ser Gln Asn ValGly Thr Asn Val Ala 1 5 10 5 7 PRT Artificial Sequence hTNF40 CDRL2 5Ser Ala Ser Phe Leu Tyr Ser 1 5 6 9 PRT Artificial Sequence hTNF40 CDRL36 Gln Gln Tyr Asn Ile Tyr Pro Leu Thr 1 5 7 17 PRT Artificial SequencehTNF40 CDRH2 7 Trp Ile Asn Thr Tyr Ile Gly Glu Pro Ile Tyr Val Asp AspPhe Lys 1 5 10 15 Gly 8 321 DNA Artificial Sequence hTF40-gL1 8 gac attcaa atg acc cag agc cca tcc agc ctg agc gca tct gta gga 48 Asp Ile GlnMet Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly 1 5 10 15 gac cgggtc acc atc act tgt aaa gcc agt cag aac gta ggt act aac 96 Asp Arg ValThr Ile Thr Cys Lys Ala Ser Gln Asn Val Gly Thr Asn 20 25 30 gta gcc tggtat cag caa aaa cca ggt aaa gcc cca aaa gcc ctc atc 144 Val Ala Trp TyrGln Gln Lys Pro Gly Lys Ala Pro Lys Ala Leu Ile 35 40 45 tac agt gcc tctttc ctc tat agt ggt gta cca tac agg ttc agc gga 192 Tyr Ser Ala Ser PheLeu Tyr Ser Gly Val Pro Tyr Arg Phe Ser Gly 50 55 60 tcc ggt agt ggt actgat ttc acc ctc acg atc agt agc ctc cag cca 240 Ser Gly Ser Gly Thr AspPhe Thr Leu Thr Ile Ser Ser Leu Gln Pro 65 70 75 80 gaa gat ttc gcc acttat tac tgt caa cag tat aac atc tac cca ctc 288 Glu Asp Phe Ala Thr TyrTyr Cys Gln Gln Tyr Asn Ile Tyr Pro Leu 85 90 95 aca ttc ggt cag ggt actaaa gta gaa atc aaa 321 Thr Phe Gly Gln Gly Thr Lys Val Glu Ile Lys 100105 9 107 PRT Artificial Sequence hTF40-gL1 9 Asp Ile Gln Met Thr GlnSer Pro Ser Ser Leu Ser Ala Ser Val Gly 1 5 10 15 Asp Arg Val Thr IleThr Cys Lys Ala Ser Gln Asn Val Gly Thr Asn 20 25 30 Val Ala Trp Tyr GlnGln Lys Pro Gly Lys Ala Pro Lys Ala Leu Ile 35 40 45 Tyr Ser Ala Ser PheLeu Tyr Ser Gly Val Pro Tyr Arg Phe Ser Gly 50 55 60 Ser Gly Ser Gly ThrAsp Phe Thr Leu Thr Ile Ser Ser Leu Gln Pro 65 70 75 80 Glu Asp Phe AlaThr Tyr Tyr Cys Gln Gln Tyr Asn Ile Tyr Pro Leu 85 90 95 Thr Phe Gly GlnGly Thr Lys Val Glu Ile Lys 100 105 10 321 DNA Artificial SequencehNF40-gL2 10 gac att caa atg acc cag agc cca tcc agc ctg agc gca tct gtagga 48 Asp Ile Gln Met Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly 15 10 15 gac cgg gtc acc atc act tgt aaa gcc agt cag aac gta ggt act aac96 Asp Arg Val Thr Ile Thr Cys Lys Ala Ser Gln Asn Val Gly Thr Asn 20 2530 gta gcc tgg tat cag caa aaa cca ggt aaa gcc cca aaa ctc ctc atc 144Val Ala Trp Tyr Gln Gln Lys Pro Gly Lys Ala Pro Lys Leu Leu Ile 35 40 45tac agt gcc tct ttc ctc tat agt ggt gta cca tac agg ttc agc gga 192 TyrSer Ala Ser Phe Leu Tyr Ser Gly Val Pro Tyr Arg Phe Ser Gly 50 55 60 tccggt agt ggt act gat ttc acc ctc acg atc agt agc ctc cag cca 240 Ser GlySer Gly Thr Asp Phe Thr Leu Thr Ile Ser Ser Leu Gln Pro 65 70 75 80 gaagat ttc gcc act tat tac tgt caa cag tat aac atc tac cca ctc 288 Glu AspPhe Ala Thr Tyr Tyr Cys Gln Gln Tyr Asn Ile Tyr Pro Leu 85 90 95 aca ttcggt cag ggt act aaa gta gaa atc aaa 321 Thr Phe Gly Gln Gly Thr Lys ValGlu Ile Lys 100 105 11 107 PRT Artificial Sequence hNF40-gL2 11 Asp IleGln Met Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly 1 5 10 15 AspArg Val Thr Ile Thr Cys Lys Ala Ser Gln Asn Val Gly Thr Asn 20 25 30 ValAla Trp Tyr Gln Gln Lys Pro Gly Lys Ala Pro Lys Leu Leu Ile 35 40 45 TyrSer Ala Ser Phe Leu Tyr Ser Gly Val Pro Tyr Arg Phe Ser Gly 50 55 60 SerGly Ser Gly Thr Asp Phe Thr Leu Thr Ile Ser Ser Leu Gln Pro 65 70 75 80Glu Asp Phe Ala Thr Tyr Tyr Cys Gln Gln Tyr Asn Ile Tyr Pro Leu 85 90 95Thr Phe Gly Gln Gly Thr Lys Val Glu Ile Lys 100 105 12 354 DNAArtificial Sequence gh1hTNF40.4 (Figure 10) 12 cag gtg cag ctg gtc cagtca gga gca gag gtt aag aag cct ggt gct 48 Gln Val Gln Leu Val Gln SerGly Ala Glu Val Lys Lys Pro Gly Ala 1 5 10 15 tcc gtc aaa gtt tcg tgtaag gcc tca ggc tac gtg ttc aca gac tat 96 Ser Val Lys Val Ser Cys LysAla Ser Gly Tyr Val Phe Thr Asp Tyr 20 25 30 ggt atg aat tgg gtc aga caggcc ccg gga caa ggc ctg gaa tgg atg 144 Gly Met Asn Trp Val Arg Gln AlaPro Gly Gln Gly Leu Glu Trp Met 35 40 45 ggt tgg att aat act tac att ggagag cct att tat gct caa aag ttc 192 Gly Trp Ile Asn Thr Tyr Ile Gly GluPro Ile Tyr Ala Gln Lys Phe 50 55 60 cag ggc aga gtc acg ttc act cta gacacc tcc aca agc act gca tac 240 Gln Gly Arg Val Thr Phe Thr Leu Asp ThrSer Thr Ser Thr Ala Tyr 65 70 75 80 atg gag ctg tca tct ctg aga tcc gaggac acc gca gtg tac tat tgt 288 Met Glu Leu Ser Ser Leu Arg Ser Glu AspThr Ala Val Tyr Tyr Cys 85 90 95 gct aga gga tac aga tct tat gcc atg gactac tgg ggc cag ggt acc 336 Ala Arg Gly Tyr Arg Ser Tyr Ala Met Asp TyrTrp Gly Gln Gly Thr 100 105 110 cta gtc aca gtc tcc tca 354 Leu Val ThrVal Ser Ser 115 13 118 PRT Artificial Sequence gh1hTNF40.4 (Figure 10)13 Gln Val Gln Leu Val Gln Ser Gly Ala Glu Val Lys Lys Pro Gly Ala 1 510 15 Ser Val Lys Val Ser Cys Lys Ala Ser Gly Tyr Val Phe Thr Asp Tyr 2025 30 Gly Met Asn Trp Val Arg Gln Ala Pro Gly Gln Gly Leu Glu Trp Met 3540 45 Gly Trp Ile Asn Thr Tyr Ile Gly Glu Pro Ile Tyr Ala Gln Lys Phe 5055 60 Gln Gly Arg Val Thr Phe Thr Leu Asp Thr Ser Thr Ser Thr Ala Tyr 6570 75 80 Met Glu Leu Ser Ser Leu Arg Ser Glu Asp Thr Ala Val Tyr Tyr Cys85 90 95 Ala Arg Gly Tyr Arg Ser Tyr Ala Met Asp Tyr Trp Gly Gln Gly Thr100 105 110 Leu Val Thr Val Ser Ser 115 14 354 DNA Artificial Sequencegh3hTNF40.4 (Figure 11) 14 gag gtt cag ctg gtc gag tca gga ggc ggt ctcgtg cag cct ggc gga 48 Glu Val Gln Leu Val Glu Ser Gly Gly Gly Leu ValGln Pro Gly Gly 1 5 10 15 tca ctg aga ttg tcc tgt gct gca tct ggt tacgtc ttc aca gac tat 96 Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Tyr ValPhe Thr Asp Tyr 20 25 30 gga atg aat tgg gtt aga cag gcc ccg gga aag ggcctg gaa tgg atg 144 Gly Met Asn Trp Val Arg Gln Ala Pro Gly Lys Gly LeuGlu Trp Met 35 40 45 ggt tgg att aat act tac att gga gag cct att tat gctgac agc gtc 192 Gly Trp Ile Asn Thr Tyr Ile Gly Glu Pro Ile Tyr Ala AspSer Val 50 55 60 aag ggc aga ttc acg ttc tct cta gac aca tcc aag tca acagca tac 240 Lys Gly Arg Phe Thr Phe Ser Leu Asp Thr Ser Lys Ser Thr AlaTyr 65 70 75 80 ctc caa atg aat agc ctg aga gca gag gac acc gca gtg tactat tgt 288 Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Ala Val Tyr TyrCys 85 90 95 gct aga gga tac aga tct tat gcc atg gac tac tgg ggc cag ggtacc 336 Ala Arg Gly Tyr Arg Ser Tyr Ala Met Asp Tyr Trp Gly Gln Gly Thr100 105 110 cta gtc aca gtc tcc tca 354 Leu Val Thr Val Ser Ser 115 15118 PRT Artificial Sequence gh3hTNF40.4 (Figure 11) 15 Glu Val Gln LeuVal Glu Ser Gly Gly Gly Leu Val Gln Pro Gly Gly 1 5 10 15 Ser Leu ArgLeu Ser Cys Ala Ala Ser Gly Tyr Val Phe Thr Asp Tyr 20 25 30 Gly Met AsnTrp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Met 35 40 45 Gly Trp IleAsn Thr Tyr Ile Gly Glu Pro Ile Tyr Ala Asp Ser Val 50 55 60 Lys Gly ArgPhe Thr Phe Ser Leu Asp Thr Ser Lys Ser Thr Ala Tyr 65 70 75 80 Leu GlnMet Asn Ser Leu Arg Ala Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95 Ala ArgGly Tyr Arg Ser Tyr Ala Met Asp Tyr Trp Gly Gln Gly Thr 100 105 110 LeuVal Thr Val Ser Ser 115 16 9 DNA Artificial Sequence Primer 16 gccgccacc9 17 26 DNA Artificial Sequence Primer CH1 17 atgaaatgca gctgggtcatsttctt 26 18 26 DNA Artificial Sequence Primer CH2 18 atgggatggagctrtatcat sytctt 26 19 26 DNA Artificial Sequence Primer CH3 19atgaagwtgt ggttaaactg ggtttt 26 20 23 DNA Artificial Sequence Primer CH420 atgractttg ggytcagctt grt 23 21 26 DNA Artificial Sequence Primer CH521 atggactcca ggctcaattt agtttt 26 22 26 DNA Artificial Sequence PrimerCH6 22 atggctgtcy trgsgctrct cttctg 26 23 26 DNA Artificial SequencePrimer CH7 23 atggratgga gckggrtctt tmtctt 26 24 23 DNA ArtificialSequence Primer CH8 24 atgagagtgc tgattctttt gtg 23 25 26 DNA ArtificialSequence Primer CH9 25 atggmttggg tgtggamctt gctatt 26 26 26 DNAArtificial Sequence Primer CH10 26 atgggcagac ttacattctc attcct 26 27 28DNA Artificial Sequence Primer CH11 27 atggattttg ggctgatttt ttttattg 2828 26 DNA Artificial Sequence Primer CH12 28 atgatggtgt taagtcttctgtacct 26 29 21 DNA Artificial Sequence 5′ end 29 gcgcgcaagc ttgccgccacc 21 30 29 DNA Artificial Sequence Primer CL1 30 atgaagttgc ctgttaggctgttggtgct 29 31 29 DNA Artificial Sequence Primer CL2 31 atggagwcagacacactcct gytatgggt 29 32 23 DNA Artificial Sequence Primer CL3 32atgagtgtgc tcactcaggt cct 23 33 26 DNA Artificial Sequence Primer CL4 33atgaggrccc ctgctcagwt tyttgg 26 34 29 DNA Artificial Sequence Primer CL534 atggatttwc aggtgcagat twtcagctt 29 35 29 DNA Artificial SequencePrimer CL5A 35 atggatttwc argtgcagat twtcagctt 29 36 26 DNA ArtificialSequence Primer CL6 36 atgaggtkcy ytgytsagyt yctgrg 26 37 23 DNAArtificial Sequence Primer CL7 37 atgggcwtca agatggagtc aca 23 38 29 DNAArtificial Sequence Primer CL8 38 atgtggggay ctktttycmm tttttcaat 29 3924 DNA Artificial Sequence Primer CL9 39 atggtrtccw casctcagtt cctt 2440 26 DNA Artificial Sequence Primer CL10 40 atgtatatat gtttgttgtctatttc 26 41 26 DNA Artificial Sequence Primer CL11 41 atggaagccccagctcagct tctctt 26 42 26 DNA Artificial Sequence Primer CL12A 42atgragtywc agacccaggt cttyrt 26 43 26 DNA Artificial Sequence PrimerCL12B 43 atggagacac attctcaggt ctttgt 26 44 26 DNA Artificial SequencePrimer CL13 44 atggattcac aggcccaggt tcttat 26 45 26 DNA ArtificialSequence Primer CL14 45 atgatgagtc ctgcccagtt cctgtt 26 46 29 DNAArtificial Sequence Primer CL15 46 atgaatttgc ctgttcatct cttggtgct 29 4729 DNA Artificial Sequence Primer CL16 47 atggattttc aattggtcctcatctcctt 29 48 26 DNA Artificial Sequence Primer CL17A 48 atgaggtgcctarctsagtt cctgrg 26 49 26 DNA Artificial Sequence Primer CL17B 49atgaagtact ctgctcagtt tctagg 26 50 26 DNA Artificial Sequence PrimerCL17C 50 atgaggcatt ctcttcaatt cttggg 26 51 21 DNA Artificial Sequence5′ end 51 ggactgttcg aagccgccac c 21 52 30 DNA Artificial SequencePrimer CL12 52 ggatacagtt ggtgcagcat ccgtacgttt 30 53 37 DNA ArtificialSequence Primer R2155 53 gcagatgggc ccttcgttga ggctgmrgag acdgtga 37 5424 DNA Artificial Sequence Primer R1053 54 gctgacagac taacagactg ttcc 2455 18 DNA Artificial Sequence Primer R720 55 gctctcggag gtgctcct 18 5670 DNA Artificial Sequence Oligonucletide P7982 56 57 71 DNA ArtificialSequence Oligonucleotide P7983 57 atagaggaaa gaggcactgt agatgagggcttttggggct ttacctggtt tttgctgata 60 ccaggctacg t 71 58 71 DNA ArtificialSequence Oligonucletide P7984 58 tacagtgcct ctttcctcta tagtggtgtaccatacaggt tcagcggatc cggtagtggt 60 actgatttca c 71 59 71 DNA ArtificialSequence Oligonucleotide P7985 59 gacagtaata agtggcgaaa tcttctggctggaggctact gatcgtgagg gtgaaatcag 60 taccactacc g 71 60 89 DNA ArtificialSequence Oligonucleotide P7986 60 atttcgccac ttattactgt caacagtataacatctaccc actcacattc ggtcagggta 60 ctaaagtaga aatcaaacgt acggaattc 8961 30 DNA Artificial Sequence Oligonucleotide P7981 61 gaattcagggtcaccatcac ttgtaaagcc 30 62 30 DNA Artificial Sequence OligonucleotideP7980 62 gaattccgta cgtttgattt ctactttagt 30 63 24 DNA ArtificialSequence Oligonucleotide R1053 63 gctgacagac taacagactg ttcc 24 64 57DNA Artificial Sequence Oligonucleotide R5350 64 tctagatggc acaccatctgctaagtttga tgcagcatag atcaggagct taggagc 57 65 59 DNA ArtificialSequence Oligonucleotide R5349 65 gcagatggtg tgccatctag attcagtggcagtggatcag gcacagactt taccctaac 59 66 18 DNA Artificial SequenceOligonucleotide R684 66 ttcaactgct catcagat 18 67 65 DNA ArtificialSequence Primer P7989 67 gaagcaccag gcttcttaac ctctgctcct gactggaccagctgcacctg agagtgcacg 60 aattc 65 68 71 DNA Artificial Sequence PrimerP7990 68 ggttaagaag cctggtgctt ccgtcaaagt ttcgtgtaag gcctcaggctacgtgttcac 60 agactatggt a 71 69 71 DNA Artificial Sequence Primer P799169 ccaacccatc catttcaggc cttgtcccgg ggcctgcttg acccaattca taccatagtc 60tgtgaacacg t 71 70 81 DNA Artificial Sequence Primer P7995 70 ggcctgaaatggatgggttg gattaatact tacattggag agcctattta tgttgacgac 60 ttcaagggcagattcacgtt c 81 71 56 DNA Artificial Sequence Primer P7992 71 ccatgtatgcagtgcgttgt ggaggtgtct agagtgaacg tgaatctgcc cttgaa 56 72 62 DNAArtificial Sequence Primer P7993 72 ccacaagcac tgcatacatg gagctgtcatctctgagatc cgaggacacc gcagtgtact 60 at 62 73 78 DNA Artificial SequencePrimer P7994 73 gaattcggta ccctggcccc agtagtccat ggcataagat ctgtatcctctagcacaata 60 gtacactgcg gtgtcctc 78 74 30 DNA Artificial SequencePrimer 7988 74 gaattcgtgc actctcaggt gcagctggtc 30 75 30 DNA ArtificialSequence Primer P7987 75 gaattcggta ccctggcccc agtagtccat 30 76 65 DNAArtificial Sequence Primer P7999 76 gatccgccag gctgcacgag accgcctcctgactcgacca gctgaacctc agagtgcacg 60 aattc 65 77 71 DNA ArtificialSequence Primer P8000 77 tctcgtgcag cctggcggat cgctgagatt gtcctgtgctgcatctggtt acgtcttcac 60 agactatgga a 71 78 71 DNA Artificial SequencePrimer P8001 78 ccaacccatc catttcaggc cctttcccgg ggcctgctta acccaattcattccatagtc 60 tgtgaagacg t 71 79 55 DNA Artificial Sequence Primer P799779 80 62 DNA Artificial Sequence Primer P7998 80 ccaagtcaac agcatacctccaaatgaata gcctgagagc agaggacacc gcagtgtact 60 at 62 81 78 DNAArtificial Sequence Primer P7993 81 gaattcggta ccctggcccc agtagtccatggcataagat ctgtatcctc tagcacaata 60 gtacactgcg gtgtcctc 78 82 30 DNAArtificial Sequence Primer P7996 82 gaattcgtgc actctgaggt tcagctggtc 3083 74 DNA Artificial Sequence 5′ Primer 83 cgcgcggcaa ttgcagtggccttggctggt ttcgctaccg tagcgcaagc tgacattcaa 60 atgacccaga gccc 74 84 20DNA Artificial Sequence 3′ Primer 84 ttcaactgct catcagatgg 20 85 78 DNAArtificial Sequence 5′ Primer 85 gctatcgcaa ttgcagtggc gctagctggtttcgccaccg tggcgcaagc tgaggttcag 60 ctggtcgagt caggaggc 78 86 18 DNAArtificial Sequence 3′ Primer 86 gcctgagttc cacgacac 18 87 23 PRTArtificial Sequence Human Group 1 consensus framework L1 87 Asp Ile GlnMet Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly 1 5 10 15 Asp ArgVal Thr Ile Thr Cys 20 88 69 PRT Artificial Sequence hTNF40 framework L188 Ala Ser Pro Ile Leu Glu Val Ala Leu Met Glu Thr Thr His Arg Gly 1 510 15 Leu Asn Ser Glu Arg Gly Leu Asn Leu Tyr Ser Pro His Glu Met Glu 2025 30 Thr Ser Glu Arg Thr His Arg Ser Glu Arg Val Ala Leu Gly Leu Tyr 3540 45 Ala Ser Pro Ala Arg Gly Val Ala Leu Ser Glu Arg Val Ala Leu Thr 5055 60 His Arg Cys Tyr Ser 65 89 15 PRT Artificial Sequence Human group 1consensus framework L2 89 Trp Tyr Gln Gln Lys Pro Gly Lys Ala Pro LysLeu Leu Ile Tyr 1 5 10 15 90 15 PRT Artificial Sequence hTNF40 frameworkL2 90 Trp Tyr Gln Gln Lys Pro Gly Gln Ser Pro Lys Ala Leu Ile Tyr 1 5 1015 91 32 PRT Artificial Sequence Human group 1 consensus framework L3 91Gly Val Pro Ser Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr 1 5 1015 Leu Thr Ile Ser Ser Leu Gln Pro Glu Asp Phe Ala Thr Tyr Tyr Cys 20 2530 92 32 PRT Artificial Sequence hTNF40 framework L3 92 Gly Val Pro TyrArg Phe Thr Gly Ser Gly Ser Gly Thr Asp Phe Thr 1 5 10 15 Leu Thr IleSer Thr Val Gln Ser Glu Asp Leu Ala Glu Tyr Phe Cys 20 25 30 93 11 PRTArtificial Sequence Human group 1 consensus framework L4 93 Phe Gly GlnGly Thr Lys Val Glu Ile Lys Arg 1 5 10 94 11 PRT Artificial SequencehTNF40 framework L4 94 Phe Gly Ala Gly Thr Lys Leu Glu Leu Lys Arg 1 510 95 30 PRT Artificial Sequence Human group 1 consensus framework H1 95Gln Val Gln Leu Val Gln Ser Gly Ala Glu Val Lys Lys Pro Gly Ala 1 5 1015 Ser Val Lys Val Ser Cys Lys Ala Ser Gly Tyr Thr Phe Thr 20 25 30 9630 PRT Artificial Sequence hTNF40 framework H1 96 Gln Ile Gln Leu ValGln Ser Gly Pro Glu Leu Lys Lys Pro Gly Glu 1 5 10 15 Thr Val Lys IleSer Cys Lys Ala Ser Gly Tyr Val Phe Thr 20 25 30 97 14 PRT ArtificialSequence Human group 1 consensus framework H2 97 Trp Val Arg Gln Ala ProGly Gln Gly Leu Glu Trp Met Gly 1 5 10 98 14 PRT Artificial SequencehTNF40 framework H2 98 Trp Val Lys Gln Ala Pro Gly Lys Ala Phe Lys TrpMet Gly 1 5 10 99 32 PRT Artificial Sequence Human group 1 consensusframework H3 99 Arg Val Thr Ile Thr Arg Asp Thr Ser Thr Ser Thr Ala TyrMet Glu 1 5 10 15 Leu Ser Ser Leu Arg Ser Glu Asp Thr Ala Val Tyr TyrCys Ala Arg 20 25 30 100 32 PRT Artificial Sequence hTNF40 framework H3100 Arg Phe Ala Phe Ser Leu Glu Thr Ser Ala Ser Thr Ala Phe Leu Gln 1 510 15 Ile Asn Asn Leu Lys Asn Glu Asp Thr Ala Thr Tyr Phe Cys Ala Arg 2025 30 101 11 PRT Artificial Sequence Human group 1 consensus frameworkH4 101 Trp Gly Gln Gly Thr Leu Val Thr Val Ser Ser 1 5 10 102 11 PRTArtificial Sequence hTNF40 framework H4 102 Trp Gly Gln Gly Thr Thr LeuThr Val Ser Ser 1 5 10 103 324 DNA Murine CDS (1)..(324) 103 gac att gtgatg acc cag tct caa aaa ttc atg tcc aca tca gta gga 48 Asp Ile Val MetThr Gln Ser Gln Lys Phe Met Ser Thr Ser Val Gly 1 5 10 15 gac agg gtcagc gtc acc tgc aag gcc agt cag aat gtg ggt act aat 96 Asp Arg Val SerVal Thr Cys Lys Ala Ser Gln Asn Val Gly Thr Asn 20 25 30 gta gcc tgg tatcaa cag aaa cca gga caa tct cct aaa gca ctg att 144 Val Ala Trp Tyr GlnGln Lys Pro Gly Gln Ser Pro Lys Ala Leu Ile 35 40 45 tac tcg gca tcc ttccta tat agt gga gtc cct tat cgc ttc aca ggc 192 Tyr Ser Ala Ser Phe LeuTyr Ser Gly Val Pro Tyr Arg Phe Thr Gly 50 55 60 agt gga tct ggg aca gatttc act ctc acc atc agc act gtg cag tct 240 Ser Gly Ser Gly Thr Asp PheThr Leu Thr Ile Ser Thr Val Gln Ser 65 70 75 80 104 108 PRT Murine 104Asp Ile Val Met Thr Gln Ser Gln Lys Phe Met Ser Thr Ser Val Gly 1 5 1015 Asp Arg Val Ser Val Thr Cys Lys Ala Ser Gln Asn Val Gly Thr Asn 20 2530 Val Ala Trp Tyr Gln Gln Lys Pro Gly Gln Ser Pro Lys Ala Leu Ile 35 4045 Tyr Ser Ala Ser Phe Leu Tyr Ser Gly Val Pro Tyr Arg Phe Thr Gly 50 5560 Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr Ile Ser Thr Val Gln Ser 65 7075 80 Glu Asp Leu Ala Glu Tyr Phe Cys Gln Gln Tyr Asn Ile Tyr Pro Leu 8590 95 Thr Phe Gly Ala Gly Thr Lys Leu Glu Leu Lys Arg 100 105 105 354DNA Artificial Sequence hTNF40 heavy chain variable domain 105 cag atccag ttg gtg cag tct gga cct gag ctg aag aag cct gga gag 48 Gln Ile GlnLeu Val Gln Ser Gly Pro Glu Leu Lys Lys Pro Gly Glu 1 5 10 15 aca gtcaag atc tcc tgc aag gct tct gga tat gtt ttc aca gac tat 96 Thr Val LysIle Ser Cys Lys Ala Ser Gly Tyr Val Phe Thr Asp Tyr 20 25 30 gga atg aattgg gtg aag cag gct cca gga aag gct ttc aag tgg atg 144 Gly Met Asn TrpVal Lys Gln Ala Pro Gly Lys Ala Phe Lys Trp Met 35 40 45 ggc tgg ata aacacc tac att gga gag cca ata tat gtt gat gac ttc 192 Gly Trp Ile Asn ThrTyr Ile Gly Glu Pro Ile Tyr Val Asp Asp Phe 50 55 60 aag gga cga ttt gccttc tct ttg gaa acc tct gcc agc act gcc ttt 240 Lys Gly Arg Phe Ala PheSer Leu Glu Thr Ser Ala Ser Thr Ala Phe 65 70 75 80 ttg cag atc aac aacctc aaa aat gag gac acg gct aca tat ttc tgt 288 Leu Gln Ile Asn Asn LeuLys Asn Glu Asp Thr Ala Thr Tyr Phe Cys 85 90 95 gca aga ggt tac cgg tcctat gct atg gac tac tgg ggt caa gga acc 336 Ala Arg Gly Tyr Arg Ser TyrAla Met Asp Tyr Trp Gly Gln Gly Thr 100 105 110 tca gtc acc gtc tct tca354 Ser Val Thr Val Ser Ser 115 106 118 PRT Artificial Sequence hTNF40heavy chain variable domain 106 Gln Ile Gln Leu Val Gln Ser Gly Pro GluLeu Lys Lys Pro Gly Glu 1 5 10 15 Thr Val Lys Ile Ser Cys Lys Ala SerGly Tyr Val Phe Thr Asp Tyr 20 25 30 Gly Met Asn Trp Val Lys Gln Ala ProGly Lys Ala Phe Lys Trp Met 35 40 45 Gly Trp Ile Asn Thr Tyr Ile Gly GluPro Ile Tyr Val Asp Asp Phe 50 55 60 Lys Gly Arg Phe Ala Phe Ser Leu GluThr Ser Ala Ser Thr Ala Phe 65 70 75 80 Leu Gln Ile Asn Asn Leu Lys AsnGlu Asp Thr Ala Thr Tyr Phe Cys 85 90 95 Ala Arg Gly Tyr Arg Ser Tyr AlaMet Asp Tyr Trp Gly Gln Gly Thr 100 105 110 Ser Val Thr Val Ser Ser 115107 84 DNA Artificial Sequence OmpA oligonucleotide adaptor 107tcgagttcta gataacgagg cgtaaaaa atg aaa aag aca gct atc gca att 52 MetLys Lys Thr Ala Ile Ala Ile 1 5 gca gtg gcc ttg gct ctgacgtacg agtcagg84 Ala Val Ala Leu Ala 10 108 13 PRT Artificial Sequence OmpAoligonucleotide adaptor 108 Met Lys Lys Thr Ala Ile Ala Ile Ala Val AlaLeu Ala 1 5 10 109 67 DNA Artificial Sequence IGS cassette-1 109 g agctca cca gta aca aaa agt ttt aat aga gga gag tgt ta atg aag 48 Ser SerPro Val Thr Lys Ser Phe Asn Arg Gly Glu Cys Met Lys 1 5 10 15 aag actgct ata gca att g 67 Lys Thr Ala Ile Ala Ile 20 110 13 PRT ArtificialSequence IGS cassette-1 110 Ser Ser Pro Val Thr Lys Ser Phe Asn Arg GlyGlu Cys 1 5 10 111 8 PRT Artificial Sequence IGS cassette-1 111 Met LysLys Thr Ala Ile Ala Ile 1 5 112 69 DNA Artificial Sequence IGScassette-2 112 g agc tca cca gta aca aaa agt ttt aat aga ggg gag tgt taaa atg 47 Ser Ser Pro Val Thr Lys Ser Phe Asn Arg Gly Glu Cys Met 1 5 10aag aag act gct ata gca att g 69 Lys Lys Thr Ala Ile Ala Ile 15 20 11313 PRT Artificial Sequence IGS cassette-2 113 Ser Ser Pro Val Thr LysSer Phe Asn Arg Gly Glu Cys 1 5 10 114 8 PRT Artificial Sequence IGScassette-2 114 Met Lys Lys Thr Ala Ile Ala Ile 1 5 115 81 DNA ArtificialSequence IGS cassette-3 115 g agc tca cca gta aca aaa agc ttt aat agagga gag tgt tga 43 Ser Ser Pro Val Thr Lys Ser Phe Asn Arg Gly Glu Cys 15 10 ggaggaaaaa aaa atg aag aaa act gct ata gca att g 81 Met Lys Lys ThrAla Ile Ala Ile 15 20 116 13 PRT Artificial Sequence IGS cassette-3 116Ser Ser Pro Val Thr Lys Ser Phe Asn Arg Gly Glu Cys 1 5 10 117 8 PRTArtificial Sequence IGS cassette-3 117 Met Lys Lys Thr Ala Ile Ala Ile 15 118 81 DNA Artificial Sequence IGS cassette-4 118 g agc tca cca gtaaca aaa agt ttt aat aga gga gag tgt tga 43 Ser Ser Pro Val Thr Lys SerPhe Asn Arg Gly Glu Cys 1 5 10 cgaggattat ata atg aag aaa act gct atagca att g 81 Met Lys Lys Thr Ala Ile Ala Ile 15 20 119 13 PRT ArtificialSequence IGS cassette-4 119 Ser Ser Pro Val Thr Lys Ser Phe Asn Arg GlyGlu Cys 1 5 10 120 8 PRT Artificial Sequence IGS cassette-4 120 Met LysLys Thr Ala Ile Ala Ile 1 5 121 30 PRT Artificial Sequence Human group 3consensus framework H1 121 Glu Val Gln Leu Val Glu Ser Gly Gly Gly LeuVal Gln Pro Gly Gly 1 5 10 15 Ser Leu Arg Leu Ser Cys Ala Ala Ser GlyPhe Thr Phe Ser 20 25 30 122 14 PRT Artificial Sequence Human group 3consensus framework H2 122 Trp Val Arg Gln Ala Pro Gly Lys Gly Leu GluTrp Val Ser 1 5 10 123 32 PRT Artificial Sequence Human group 3consensus framework H3 123 Arg Phe Thr Ile Ser Arg Asp Asn Ser Lys AsnThr Leu Tyr Leu Gln 1 5 10 15 Met Asn Ser Leu Arg Ala Glu Asp Thr AlaVal Tyr Tyr Cys Ala Arg 20 25 30 124 11 PRT Artificial Sequence Humangroup 3 consensus framework H4 124 Trp Gly Gln Gly Thr Leu Val Thr ValSer Ser 1 5 10 125 648 DNA Artificial Sequence Grafted heavy chain forfab 125 gaggttcagc tggtcgagtc aggaggcggt ctcgtgcagc ctggcggatcactgagattg 60 tcctgtgctg catctggtta cgtcttcaca gactatggaa tgaattgggttagacaggcc 120 ccgggaaagg gcctggaatg gatgggttgg attaatactt acattggagagcctatttat 180 gctgacagcg tcaagggcag attcacgttc tctctagaca catccaagtcaacagcatac 240 ctccaaatga atagcctgag agcagaggac accgcagtgt actattgtgctagaggatac 300 agatcttatg ccatggacta ctggggccag ggtaccctag tcacagtctcctcagcttcc 360 accaagggcc catcggtctt ccccctggca ccctcctcca agagcacctctgggggcaca 420 gcggccctgg gctgcctggt caaggactac ttccccgaac cggtgacggtgtcgtggaac 480 tcaggcgccc tgaccagcgg cgtgcacacc ttcccggctg tcctacagtcctcaggactc 540 tactccctca gcagcgtggt gaccgtgccc tccagcagct tgggcacccagacctacatc 600 tgcaacgtga atcacaagcc cagcaacacc aaggtcgaca agaaagtt 648126 216 PRT Artificial Sequence Grafted heavy chain for fab 126 Glu ValGln Leu Val Glu Ser Gly Gly Gly Leu Val Gln Pro Gly Gly 1 5 10 15 SerLeu Arg Leu Ser Cys Ala Ala Ser Gly Tyr Val Phe Thr Asp Tyr 20 25 30 GlyMet Asn Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Met 35 40 45 GlyTrp Ile Asn Thr Tyr Ile Gly Glu Pro Ile Tyr Ala Asp Ser Val 50 55 60 LysGly Arg Phe Thr Phe Ser Leu Asp Thr Ser Lys Ser Thr Ala Tyr 65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95Ala Arg Gly Tyr Arg Ser Tyr Ala Met Asp Tyr Trp Gly Gln Gly Thr 100 105110 Leu Val Thr Val Ser Ser Ala Ser Thr Lys Gly Pro Ser Val Phe Pro 115120 125 Leu Ala Pro Ser Ser Lys Ser Thr Ser Gly Gly Thr Ala Ala Leu Gly130 135 140 Cys Leu Val Lys Asp Tyr Phe Pro Glu Pro Val Thr Val Ser TrpAsn 145 150 155 160 Ser Gly Ala Leu Thr Ser Gly Val His Thr Phe Pro AlaVal Leu Gln 165 170 175 Ser Ser Gly Leu Tyr Ser Leu Ser Ser Val Val ThrVal Pro Ser Ser 180 185 190 Ser Leu Gly Thr Gln Thr Tyr Ile Cys Asn ValAsn His Lys Pro Ser 195 200 205 Asn Thr Lys Val Asp Lys Lys Val 210 215127 642 DNA Artificial Sequence Grafted light chain for fab and modifiedfab 127 gacattcaaa tgacccagag cccatccagc ctgagcgcat ctgtaggagaccgggtcacc 60 atcacttgta aagccagtca gaacgtaggt actaacgtag cctggtatcagcaaaaacca 120 ggtaaagccc caaaagccct catctacagt gcctctttcc tctatagtggtgtaccatac 180 aggttcagcg gatccggtag tggtactgat ttcaccctca cgatcagtagcctccagcca 240 gaagatttcg ccacttatta ctgtcaacag tataacatct acccactcacattcggtcag 300 ggtactaaag tagaaatcaa acgtacggta gcggccccat ctgtcttcatcttcccgcca 360 tctgatgagc agttgaaatc tggaactgcc tctgttgtgt gcctgctgaataacttctat 420 cccagagagg ccaaagtaca gtggaaggtg gataacgccc tccaatcgggtaactcccag 480 gagagtgtca cagagcagga cagcaaggac agcacctaca gcctcagcagcaccctgacg 540 ctgagcaaag cagactacga gaaacacaaa gtctacgcct gcgaagtcacccatcagggc 600 ctgagctcac cagtaacaaa aagctttaat agaggagagt gt 642 128214 PRT Artificial Sequence Grafted light chain for fab and modified fab128 Asp Ile Gln Met Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly 1 510 15 Asp Arg Val Thr Ile Thr Cys Lys Ala Ser Gln Asn Val Gly Thr Asn 2025 30 Val Ala Trp Tyr Gln Gln Lys Pro Gly Lys Ala Pro Lys Ala Leu Ile 3540 45 Tyr Ser Ala Ser Phe Leu Tyr Ser Gly Val Pro Tyr Arg Phe Ser Gly 5055 60 Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr Ile Ser Ser Leu Gln Pro 6570 75 80 Glu Asp Phe Ala Thr Tyr Tyr Cys Gln Gln Tyr Asn Ile Tyr Pro Leu85 90 95 Thr Phe Gly Gln Gly Thr Lys Val Glu Ile Lys Arg Thr Val Ala Ala100 105 110 Pro Ser Val Phe Ile Phe Pro Pro Ser Asp Glu Gln Leu Lys SerGly 115 120 125 Thr Ala Ser Val Val Cys Leu Leu Asn Asn Phe Tyr Pro ArgGlu Ala 130 135 140 Lys Val Gln Trp Lys Val Asp Asn Ala Leu Gln Ser GlyAsn Ser Gln 145 150 155 160 Glu Ser Val Thr Glu Gln Asp Ser Lys Asp SerThr Tyr Ser Leu Ser 165 170 175 Ser Thr Leu Thr Leu Ser Lys Ala Asp TyrGlu Lys His Lys Val Tyr 180 185 190 Ala Cys Glu Val Thr His Gln Gly LeuSer Ser Pro Val Thr Lys Ser 195 200 205 Phe Asn Arg Gly Glu Cys 210 129687 DNA Artificial Sequence Grafted heavy chain for modified fab 129gaggttcagc tggtcgagtc aggaggcggt ctcgtgcagc ctggcggatc actgagattg 60tcctgtgctg catctggtta cgtcttcaca gactatggaa tgaattgggt tagacaggcc 120ccgggaaagg gcctggaatg gatgggttgg attaatactt acattggaga gcctatttat 180gctgacagcg tcaagggcag attcacgttc tctctagaca catccaagtc aacagcatac 240ctccaaatga atagcctgag agcagaggac accgcagtgt actattgtgc tagaggatac 300agatcttatg ccatggacta ctggggccag ggtaccctag tcacagtctc ctcagcttcc 360accaagggcc catcggtctt ccccctggca ccctcctcca agagcacctc tgggggcaca 420gcggccctgg gctgcctggt caaggactac ttccccgaac cggtgacggt gtcgtggaac 480tcaggcgccc tgaccagcgg cgtgcacacc ttcccggctg tcctacagtc ctcaggactc 540tactccctca gcagcgtggt gaccgtgccc tccagcagct tgggcaccca gacctacatc 600tgcaacgtga atcacaagcc cagcaacacc aaggtcgaca agaaagttga gcccaaatct 660tgtgacaaaa ctcacacatg cgccgcg 687 130 229 PRT Artificial SequenceGrafted heavy chain for modified fab 130 Glu Val Gln Leu Val Glu Ser GlyGly Gly Leu Val Gln Pro Gly Gly 1 5 10 15 Ser Leu Arg Leu Ser Cys AlaAla Ser Gly Tyr Val Phe Thr Asp Tyr 20 25 30 Gly Met Asn Trp Val Arg GlnAla Pro Gly Lys Gly Leu Glu Trp Met 35 40 45 Gly Trp Ile Asn Thr Tyr IleGly Glu Pro Ile Tyr Ala Asp Ser Val 50 55 60 Lys Gly Arg Phe Thr Phe SerLeu Asp Thr Ser Lys Ser Thr Ala Tyr 65 70 75 80 Leu Gln Met Asn Ser LeuArg Ala Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95 Ala Arg Gly Tyr Arg SerTyr Ala Met Asp Tyr Trp Gly Gln Gly Thr 100 105 110 Leu Val Thr Val SerSer Ala Ser Thr Lys Gly Pro Ser Val Phe Pro 115 120 125 Leu Ala Pro SerSer Lys Ser Thr Ser Gly Gly Thr Ala Ala Leu Gly 130 135 140 Cys Leu ValLys Asp Tyr Phe Pro Glu Pro Val Thr Val Ser Trp Asn 145 150 155 160 SerGly Ala Leu Thr Ser Gly Val His Thr Phe Pro Ala Val Leu Gln 165 170 175Ser Ser Gly Leu Tyr Ser Leu Ser Ser Val Val Thr Val Pro Ser Ser 180 185190 Ser Leu Gly Thr Gln Thr Tyr Ile Cys Asn Val Asn His Lys Pro Ser 195200 205 Asn Thr Lys Val Asp Lys Lys Val Glu Pro Lys Ser Cys Asp Lys Thr210 215 220 His Thr Cys Ala Ala 225

1. An antibody molecule having specificity for human TNFα, comprising aheavy chain wherein the variable domain comprises a complementaritydetermining region (CDR) having the sequence given as H1 in FIG. 3 (SEQID NO:1) for CDRH1, as H2′ in FIG. 3 (SEQ ID NO:2) or as H2 in FIG. 3(SEQ ID NO:7) for CDRH2 or as H3 in FIG. 3 (SEQ ID NO:3) for CDRH3. 2.An antibody molecule having specificity for human TNFα, comprising alight chain wherein the variable domain comprises a CDR having thesequence given as L1 in FIG. 3 (SEQ ID NO:4) for CDRL1, as L2 in FIG. 3(SEQ ID NO:5) for CDRL2 or as L3 in FIG. 3 (SEQ ID NO:6) for CDRL3. 3.An antibody molecule having specificity for human TNFα, comprising aheavy chain wherein the variable domain comprises a CDR having thesequence given in SEQ ID NO:1 for CDRH1, SEQ ID NO:2 or SEQ ID NO:7, forCDRH2 or SEQ ID NO:3 for CDRH3 and a light chain wherein the variabledomain comprises a CDR having the sequence given in SEQ ID NO:4 forCDRL1, SEQ ID NO:5 for CDRL2 or SEQ ID NO:6 for CDRL3.
 4. The antibodymolecule of claim 3, which comprises SEQ ID NO:1 for CDRH1, SEQ ID NO:2or SEQ ID NO:7 for CDRH2, SEQ ID NO:3 for CDRH3, SEQ ID NO:4 for CDRL1,SEQ ID NO:5 for CDRL2 and SEQ ID NO:6 for CDRL3.
 5. The antibodymolecule of any one of claims 1 to 3, which comprises SEQ ID NO:2 forCDRH2.
 6. The antibody molecule of any one of claims 1 to 3, which is aCDR-grafted antibody molecule.
 7. The antibody molecule of claim 6,wherein the variable domain comprises human acceptor framework regionsand non-human donor CDRs.
 8. The antibody molecule of claim 7, whereinthe human acceptor framework regions of the variable domain of the heavychain are based on a human group 1 consensus sequence and comprisenon-human donor residues at positions 28, 69 and
 71. 9. The antibodymolecule of claim 7, wherein the human acceptor framework regions of thevariable domain of the heavy chain are based on a human group 1consensus sequence and comprise non-human donor residues at positions28, 38, 46, 67, 69 and
 71. 10. The antibody molecule of claim 7, whereinthe human acceptor framework regions of the variable domain of the heavychain are based on a human group 3 consensus sequence and comprisenon-human donor residues at positions 27, 28, 30, 48 49, 69, 71, 73 76and
 78. 11. The antibody molecule of claim 7, wherein the human acceptorframework regions of the variable domain of the light chain are based onhuman group 1 consensus sequence and comprise non-human donor residuesat positions 46 and
 60. 12. The antibody molecule of claim 3, comprisingthe light chain variable region hTNF40-gL1 (SEQ ID NO:8) and the heavychain variable region gh3hTNF40.4 (SEQ ID NO:11).
 13. The antibodymolecule of any one of claims 1 to 3 which is a Fab fragment.
 14. Theantibody molecule of claim 13, which is a Fab fragment comprising aheavy chain having the sequence given in SEQ ID NO:111 and a light chainhaving the sequence given in SEQ ID NO:113.
 15. The antibody molecule ofclaim 1, which is a modified Fab fragment having at the C-terminal endof its heavy chain one or more amino acids to allow attachment of aneffector or reporter molecule.
 16. The antibody molecule of claim 15,wherein the additional amino acids form a modified hinge regioncontaining one or two cysteine residues to which the effector orreporter molecule may be attached.
 17. The antibody molecule of claim12, which is a modified Fab fragment comprising a heavy chain having thesequence given in SEQ ID NO:115 and a light chain having the sequencegiven in SEQ ID NO:113.
 18. An antibody molecule having specificity forhuman TNFα, having a light chain comprising the sequence given in SEQ IDNO:113.
 19. An antibody molecule having specificity for human TNFα,having a light chain consisting of the sequence given in SEQ ID NO:113.20. An antibody molecule having specificity for human TNFα, having aheavy chain comprising the sequence given in SEQ ID NO:115.
 21. Anantibody molecule having specificity for human TNFα, having a heavychain consisting of the sequence given in SEQ ID NO:115.
 22. An antibodymolecule having specificity for human TNFα, having a light chaincomprising the sequence given in SEQ ID NO:113 and a heavy chaincomprising the sequence given in SEQ ID NO:115.
 23. An antibody moleculehaving specificity for human TNFα, having a light chain consisting ofthe sequence given in SEQ ID NO:113 and a heavy chain consisting of thesequence given in SEQ ID NO:115.
 24. A variant of the antibody moleculeof claims 1 or 2, which has an improved affinity for TNFα.
 25. Thevariant of claim 24 which is obtained by an affinity maturationprotocol.
 26. The antibody of claim 3 which is murine anti-TNFαmonoclonal antibody hTNF40.
 27. The antibody molecule of claim 3, whichis a chimeric antibody molecule comprising the light and heavy chainvariable domains of the monoclonal antibody of claim
 26. 28. A compoundcomprising the antibody molecule claim 15 having covalently attached toan amino acid at or towards the C-terminal end of its heavy chain aneffector or reporter molecule.
 29. The compound of claim 28, whichcomprises an effector molecule.
 30. The compound of claim 29, whereinthe effector molecule comprises one or more polymers.
 31. The compoundof claim 30, wherein the one or more polymers is/are an optionallysubstituted straight or branched chain polyalkylene, polyalkenylene orpolyoxyalkylene polymer or a branched or unbranched polysaccharide. 32.The compound of claim 31, wherein the one or more polymers is/are amethoxypoly(ethyleneglycol).
 33. A compound comprising the antibodymolecule of claim 17 having attached to one of the cysteine residues atthe C-terminal end of the heavy chain a lysyl-maleimide group whereineach amino group of the lysyl residue has covalently linked to it amethoxypoly(ethyleneglycol) residue having a molecular weight of about20,000 Da.
 34. A compound comprising an antibody molecule havingspecificity for human TNFα, having a light chain comprising the sequencegiven in SEQ ID NO:113 and a heavy chain comprising the sequence givenin SEQ ID NO:115, having attached to one of the cysteine residues at theC-terminal end of the heavy chain one or more synthetic ornaturally-occurring polymers.
 35. A compound comprising an antibodymolecule having specificity for human TNFα, having a light chainconsisting of the sequence given in SEQ ID NO:113 and a heavy chainconsisting of the sequence given in SEQ ID NO:115, having attached toone of the cysteine residues at the C-terminal end of the heavy chainone or more synthetic or naturally-occurring polymers.
 36. A compoundcomprising an antibody molecule having specificity for human TNFα,having a light chain comprising the sequence given in SEQ ID NO:113,having attached to one of the cysteine residues at the C-terminal end ofthe heavy chain a lysyl-maleimide group wherein each amino group of thelysyl residue has covalently linked to it a methoxypoly(ethyleneglycol)residue having a molecular weight of about 20,000 Da.
 37. A compoundcomprising an antibody molecule having specificity for human TNFα,having a light chain consisting of the sequence given in SEQ ID NO:113,having attached to one of the cysteine residues at the C-terminal end ofthe heavy chain a lysyl-maleimide group wherein each amino group of thelysyl residue has covalently linked to it a methoxypoly(ethyleneglycol)residue having a molecular weight of about 20,000 Da.
 38. A compoundcomprising an antibody molecule having specificity for human TNFα,having a heavy chain comprising the sequence given in SEQ ID NO:115,having attached to one of the cysteine residues at the C-terminal end ofthe heavy chain a lysyl-maleimide group wherein each amino group of thelysyl residue has covalently linked to it a methoxypoly(ethyleneglycol)residue having a molecular weight of about 20,000 Da.
 39. A compoundcomprising an antibody molecule having specificity for human TNFα,having a heavy chain consisting of the sequence given in SEQ ID NO:115,having attached to one of the cysteine residues at the C-terminal end ofthe heavy chain a lysyl-maleimide group wherein each amino group of thelysyl residue has covalently linked to it a methoxy poly(ethyleneglycol)residue having a molecular weight of about 20,000 Da.
 40. A compoundcomprising an antibody molecule having specificity for human TNFα,having a light chain comprising the sequence given in SEQ ID NO:113 anda heavy chain comprising the sequence given in SEQ ID NO:115, havingattached to one of the cysteine residues at the C-terminal end of theheavy chain a lysyl-maleimide group wherein each amino group of thelysyl residue has covalently linked to it a methoxypoly(ethyleneglycol)residue having a molecular weight of about 20,000 Da.
 41. A compoundcomprising an antibody molecule having specificity for human TNFα,having a light chain consisting of the sequence given in SEQ ID NO:113and a heavy chain consisting of the sequence given in SEQ ID NO:115,having attached to one of the cysteine residues at the C-terminal end ofthe heavy chain a lysyl-maleimide group wherein each amino group of thelysyl residue has covalently linked to it a methoxypoly(ethyleneglycol)residue having a molecular weight of about 20,000 Da.
 42. An antibodymolecule comprising a hybrid CDR comprising a truncated donor CDRsequence wherein the missing portion of the donor CDR is replaced by adifferent sequence and forms a functional CDR.
 43. The antibody moleculeof claim 42, wherein the missing part of the CDR sequence is from theantibody from which the framework regions of the antibody molecule arederived.
 44. The antibody molecule of claim 43, wherein the missing partof the CDR sequence is derived from a germline antibody having consensusframework regions.
 45. The antibody molecule of claim 42, wherein CDRH2of the heavy chain is hybrid in the antibody molecule.
 46. The antibodymolecule of claim 42, wherein the truncation of the donor CDR is from 1to 8 amino acids.
 47. The antibody molecule of claim 46, wherein thetruncation is from 4 to 6 amino acids.
 48. The antibody molecule ofclaim 42, wherein the truncation is made at the C-terminus of the CDR.49. A DNA sequence which encodes the heavy and/or light chain of theantibody molecule of claim 3 or
 42. 50. The DNA sequence of claim 49comprising the sequence shown in SEQ ID NO:8 or
 10. 51. The DNA sequenceof claim 49 comprising the sequence shown in SEQ ID NO:10 or
 11. 52. TheDNA sequence of claim 49 comprising the sequence shown in SEQ ID NO:110,112 or
 114. 53. A cloning or expression vector containing the DNAsequence of claim
 49. 54. An E. coli expression vector comprising theDNA sequence of claim
 49. 55. The E. coli expression vector of claim 54which is pTTO(CDP870).
 56. A host cell transformed with the vector ofclaim
 53. 57. A process for the production of an antibody moleculehaving specificity for TNFα, comprising culturing the host cell of claim56 and isolating the antibody molecule.
 58. A process for the productionof an antibody molecule having specificity for TNFα, comprisingculturing E. coli comprising an E. coli expression vector comprising theDNA sequence of claim 53 and isolating the antibody molecule.
 59. Theprocess of claim 58 wherein the antibody molecule is targeted to theperiplasm.
 60. A therapeutic or diagnostic composition comprising theantibody molecule of any one of claims 1 to 3 and 42 or the compound ofclaim
 28. 61. A method to treat a subject with a pathology mediated byTNFα, comprising administering to the subject a therapeuticallyeffective amount of the antibody molecule of claims 1-3 or 42, or thecompound of claim
 28. 62. The method of claim 68, wherein the pathologyis rheumatoid- or osteo- arthritis.
 63. A method to make apharmaceutical composition for the treatment of a pathology mediated byTNFα, comprising the combining the antibody molecule of claims 1-3 or42, or the compound of claim 28 with a pharmaceutically acceptablecarrier.
 64. A method to make a pharmaceutical composition for thetreatment of rheumatoid- or osteo- arthritis, comprising the combiningthe antibody molecule of claims 1-3 or 42, or the compound of claim 28with a pharmaceutically acceptable carrier.
 65. The vector pDNAbEng-G1as shown in FIG.
 19. 66. The vector pTTO(CDP870) as shown in FIG. 22.67. A polypeptide having the amino acid sequence given in any one of SEQID NOS:1 to 7.